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> One surprising side effect of having a .xyz domain is that the mere inclusion of .xyz inside of a text message will result in a silent delivery failure for ma

> One surprising side effect of having a .xyz domain is that the mere inclusion of .xyz inside of a text message will result in a silent delivery failure for many providers. This is wild to me. Tested it out myself and I couldn't send an SMS with a spot.xyz link to/from Google Voice <-> T-Mobile. And no "failed delivery" notice either, just a silent failure. And yet I still get so many texts that are obviously spam or phishing attempts.

mcny 5y ago
One of the places I worked as a contractor recently, I could not get to abc.xyz on the work network. I tried some more xyz websites and none worked.
blendergeek 5y ago
I have this same problem with "obscure" .net domains. My text messages are silently dropped. The only work around I found is to not include http:// http://, just use the bare domain. Personally, I find this behavior of my SMS provider reprehensible.
- deleted 5y ago
  [deleted]
- idiotsecant 5y ago
  Is it reprehensible only when it impacts you or is it still reprehensible when it's blocking hundreds of spam messages a day you might otherwise be receiving?
  - epse 5y ago
    Surely there are better ways to reduce spam than blocking entire TLDs? I also think it's the silent, unfixable nature that annoys most people. Email spam goes into your spam box, where you can still access it. You can mark email as not being spam. No such luck here
    - pletsch 5y ago
      Email providers absolutely block email, its the edge cases that make your spam folder.
      - thaumasiotes 5y ago
        > its the edge cases that make your spam folder. Well, from their perspective. Not from any reasonable perspective; I have a few obviously-spam emails in my gmail spam folder right now, but I've had plenty of problems with gmail refusing to deliver completely legitimate email to me.
        pasc1878 5y ago
        If there was no filtering how many spammessages would you receive? I suspect any more than you see
        d110af5ccf 5y ago
        Those aren't silently dropped though, are they? The sending server is notified I think.
        greenyoda 5y ago
        Yeah, there's a lot of spam out there. My employer's spam filtering software used to send out weekly statistics telling us what percentage of incoming e-mails (across the entire company) were spam. The spam percentage was remarkably constant from week to week: about 90% of all incoming e-mail was spam!
        thaumasiotes 5y ago
        Who cares? The only things that make it into my spam folder are obvious spam. Meanwhile, messages from people I know personally aren't even delivered at all. There is no way to characterize this as reasonable or even acceptable. Google is using metrics that are not related to whether an email should be delivered. They need to tune whatever they're doing down to the point that legitimate personal communication at least shows up in the spam folder. If a lot more spam shows up in the spam folder too, so what? A spam folder that contains mostly spam and also some misclassified personal messages is significantly better than a spam folder that contains nothing but spam because it automatically dropped your misclassified personal messages.
  - blendergeek 5y ago
    I should receive 100% of messages from numbers I message. If my carrier wants to helpfully filter my other messages, I should be able to opt out.
- techrat 5y ago
  I ran into this recently even on Facebook Messenger. A friend of mine was hunting for a short domain name and I had a list of some three character .net and .org domains I recently had found that were available. Cut and pasted the list and the message wouldn't send. Narrowed it down to one. Typed just the bare domain. Wouldn't go through. (It was something incredibly benign like n17.org) Couldn't find a history on that domain name for why it would have been filtered. At least messenger responded with 'couldn't send message' but still no clue as to why... and it took me sending each domain name individually until I found the one that was failing the entire message.
  - Symbiote 5y ago
    If it was N26, that's a European bank so I could see similar domains being used in phishing scms.
  - aaaaaaaaaaab 5y ago
    >and it took me sending each domain name individually until I found the one that was failing the entire message. A true hacker would have used binary search ;)
    - afurculita 5y ago
      Or a distributed ElasticSearch
Thaxll 5y ago
You wonder why there is any filtering on sms ...
- Spivak 5y ago
  Because spam really is that rampant. There aren't that many communication systems with a small search domain of user ids where anyone can send and receive messages from anyone by default.
  - maxwell 5y ago
    Why not impose costs instead of filtering?
    - indymike 5y ago
      They do.
    - SilverRed 5y ago
      The latest spam method right now is to get malware on to android phones and have the actual phones do the spamming. So if there is a cost, it gets applied to random people and not the spammers. Also if there was a cost per SMS on phones these days it would be the death of SMS because no other system charges.
  - Thaxll 5y ago
    Makes sense, but then they just blacklist entire TLD, it's a bit weird.
kop316 5y ago
...whoa, yeah same here. tried "test spot.xyz" then "test spot.com" T-mobile <-> T-Mobile. "test spot.xyz" did not send. Even weirder, I got a confirmmation that it was delivered. It looks like T-Mobile looks for ".xyz" within the SMS and will silent drop the SMS (though it will claim it is delivered). ".xxyz" works, "..xyz" or ".xyzz" does not. "xyz" works, so does ".xy".
- DaiPlusPlus 5y ago
  > though it will claim it is delivered I thought SMS didn’t have delivery receipts?
  - kop316 5y ago
    They certainly do. In Chatty: https://source.puri.sm/Librem5/chatty/-/merge_requests/786 https://source.puri.sm/Librem5/chatty/-/merge_requests/786 . Some carriers even charge for the service (!!): https://source.puri.sm/Librem5/chatty/-/issues/434 https://source.puri.sm/Librem5/chatty/-/issues/434 MMS has delivery reports too (I implimented support for it myself for mainline Linux Phones). It even has read reports, but no carrier seems to honor using it (which is why I didn't bother to impliment it). I'm not sure if Android/iOS gives the user an option for it (which may be the source of confusion).
    - frosted-flakes 5y ago
      There is an option to enable delivery receipts on Android (Google and Samsung). I believe it is disabled by default.
      - kop316 5y ago
        Read reciepts or delivery reports? I'm not sure if SMS supports read reciepts, but I didn't think so. The MMS standard allows for read receipts ("MAY" not "SHALL"), I was unable to get it working, and I suspect it's due to no carrier support. I was unable to get read receipts working at all, and I suspect it's because the carrier doesn't impliment it.
krono 5y ago
Blocking of messages/emails and blanket email server/domain/extension blacklisting is the same as a postal service not delivering mail to or from a particular entity/street/town. Doing so silently and without a valid and case-specific reason should not be legally allowed. Edit: Added "street/town" to analogy, and "case-specific" before reason
- maxwell 5y ago
  The FCC classified SMS/MMS as unregulated, filterable "information services" rather than regulated "telecommunications services". https://www.fiercewireless.com/wireless/sms-mms-deemed-information-services-removing-them-from-heavier-regulation https://www.fiercewireless.com/wireless/sms-mms-deemed-infor...
  - krono 5y ago
    They should really update the "Mission and strategy" chapter on their Wikipedia page [1]. In particular the part about "Protecting Consumers & Public Safety" seems horribly outdated! I will have to look up how this works in the EU and here in The Netherlands. Something to do for the weekend. [1] https://en.wikipedia.org/wiki/Federal_Communications_Commission#Mission_and_strategy https://en.wikipedia.org/wiki/Federal_Communications_Commiss...
  - wikidani 5y ago
    I really would like to see what was the legal reason behind that, I know the US has issues with gov't agencies using their opinions as law but I thought mail was constitutionally protected?
    - maxwell 5y ago
      The FCC just makes decisions, we're talking regulations here, not laws. They justified it with "preventing spam" and enabling competition with unregulated OTT apps. I'm glad that Twilio fought for Title II governance: https://ecfsapi.fcc.gov/file/60001324418.pdf https://ecfsapi.fcc.gov/file/60001324418.pdf Where was everyone else? As far as the sanctity of the U.S. Mail, it only applies to sealed envelopes/packages, and Congress can ban items from the mail (e.g. lottery pamphlets, spurious tokens, gasoline, etc.) https://supreme.justia.com/cases/federal/us/96/727/ https://supreme.justia.com/cases/federal/us/96/727/
iconjack 5y ago
It was wild to me too. I have an .xyz domain, which seemed appropriate for a non-commercial math site. I'd try to send links of math experiments to friends and colleagues via SMS, so they could tell me if they worked right on their phones or not. Can't tell you how much confusion and frustration it caused that the links were simply not being delivered, though all the conversation around the links went through just fine. No error was reported on either end. A year or so ago, I did a lot of searching trying to find some explanation of this bizarre behavior, but found literally nothing. It's nice to know I'm not crazy, at least. Is there a published list of what domains are not allowed to go through?
- schleck8 5y ago
  > which seemed appropriate for a non-commercial math site They are used by large cooperations too. The Alphabet domain is abc.xyz. Science Corp's is science.xyz.
  - mhh__ 5y ago
    I didn't know about abc.xyz, that's a really nice URL
    - samspenc 5y ago
      Quite likely only investors in Google / Alphabet stock know that site and have it bookmarked because that's where Alphabet publishes its quarterly earnings. I also guess for the same reason, it only gets significant traffic once a quarter during earnings season.
      - lrem 5y ago
        I like to think of it as Ruth's blog ;)
- GoblinSlayer 5y ago
  SMS has a delivery confirmation feature, my phone indicates delivered and undelivered messages, so you can tell what wasn't delivered.
Scoundreller 5y ago
If you’re in Canada, and send an SMS containing the string “special message” to or from a Telus customer (or one of their sub-brands), it will be silently dropped. Telus is one of the big3 telecoms here.
- drampelt 5y ago
  I just tried on Koodo which is part of Telus, no issues sending/receiving
  - Scoundreller 5y ago
    Make sure it wasn’t iMessage
    - drampelt 5y ago
      Definitely wasn't iMessage, I tried it on my Android phone
exikyut 5y ago
> Ironically, Google Voice also has the same behavior with abc.xyz. This is my new mini-favorite thing. It feels a bit like a redux of "Shirt without stripes" (https://news.ycombinator.com/item?id=22925087 https://news.ycombinator.com/item?id=22925087)...
tiffanyh 5y ago
I wish the Telco's did MORE filtering given the huge amount of SMS spam I get since Twilio has turned this channel into a positive ROI for spammers. (1st biggest spam channel being email, which surprise/surprise - Twilio also dominates via SendGrid)
- aquark 5y ago
  I have no knowledge of the ROI involved here, but would love to understand this: Twilio is 0.75c to send a text. Is it possible for a spammer to generate >$75 per 10,000 people spammed? I've no idea were the SMS spams I've got link to (not about to find out) but they are so obviously spam. We use SMS for communicating with users and would be happy to more a lot more per text to escape the 'positive ROI for spammers' territory. I'd be happy to do that for important emails too!
  - mmerlin 5y ago
    Probably decent ROI which is why it keeps on happening! They just need one person in each 10k spammed on average, to click the phishing url asking them to pay a fake bill and then charge them $328 instead of the $3.28 displayed o the page. I received (and reported to their scam Dept) a phishing SMS yesterday pretending to be from Australia Post asking for $3.28 to release a delivery package I'm waiting for, which is most people in Australia nowadays with the current slowdown in mail delivery speed. I am only guessing that the $3.28 phishing purchase would have attempted a $328 charge on my card... but that would be wildly profitable if the input costs per successful fraud were under $100...
- callalex 5y ago
  How did you determine that these messages are through Twilio and not one of the dozens of cheap unscrupulous knockoffs? This is very easily identified, and you are are slinging serious accusations.
petercooper 5y ago
Related thing from the past.. Gmail once had a bug(?) where if you sent any email containing a URL with the domain starting "0x", it would go straight to spam. I imagine it was a rule hard coded to block the use of hexadecimal long IP URLs, but it also picked regular domains starting 0x. It was fixed a few years ago.
- ArchOversight 5y ago
  I own a domain starting with 0x and I spent a lot of time talking to people I knew at Google to get that one fixed because my mail would not be delivered.
  - petercooper 5y ago
    I'm glad to hear another first hand report of this as info was very thin on the ground at the time!
foofoo4u 5y ago
A lot of systems block anything by default that isn't standard. For example, if you happen to own a domain to serve as your email that doesn't end in .com, .edu, .gov, then many systems will instantly invalidate you saying you don't have a valid email when in reality you do. A lot of companies or programmers don't seem to realize that its 2021 where we have hundreds of domain extensions to choose from.
- devoutsalsa 5y ago
  I had a .ninja domain for a while, and I had to contact a certain DNS provide to add support for that TLD. They were very responsive, but I still had to ask.
- SilverRed 5y ago
  I think this mostly applies to TLDs with more than 3 letters. I have email on a .me and a .red and I have never had anything reject me.
- kayodelycaon 5y ago
  No issues with my .co domain.
sytelus 5y ago
I am pretty sure this is not intentional. Somewhere some classifier in Google has overfitted onto .xyz. They will probably fix that some day so this will not be true forever either.
tambeb 5y ago
I just tested example.xyz and spot.xyz between my Google Fi and Voice numbers and both were fine.
pacman2 5y ago
Pff. That is nothing. Try to run your own mailserver and deliver a mail to a t-online.de address (T Mobile Germany). They basically only accept pre-approved providers. If your have your own domain and infrastructure you have to petition them to whitelist you. Totally insane. If you can read German, this guy who runs a shop decided to block himself all of t-online emails since they basically run email out of specification. https://blog.rolandmoriz.de/2020/09/21/t-online-blockiert-mails-fuer-kunden/ https://blog.rolandmoriz.de/2020/09/21/t-online-blockiert-ma...

mcny 5y ago

One of the places I worked as a contractor recently, I could not get to abc.xyz on the work network. I tried some more xyz websites and none worked.

blendergeek 5y ago

I have this same problem with "obscure" .net domains. My text messages are silently dropped. The only work around I found is to not include http:// http://, just use the bare domain. Personally, I find this behavior of my SMS provider reprehensible.

deleted 5y ago
[deleted]
idiotsecant 5y ago
Is it reprehensible only when it impacts you or is it still reprehensible when it's blocking hundreds of spam messages a day you might otherwise be receiving?
- epse 5y ago
  Surely there are better ways to reduce spam than blocking entire TLDs? I also think it's the silent, unfixable nature that annoys most people. Email spam goes into your spam box, where you can still access it. You can mark email as not being spam. No such luck here
  - pletsch 5y ago
    Email providers absolutely block email, its the edge cases that make your spam folder.
    - thaumasiotes 5y ago
      > its the edge cases that make your spam folder. Well, from their perspective. Not from any reasonable perspective; I have a few obviously-spam emails in my gmail spam folder right now, but I've had plenty of problems with gmail refusing to deliver completely legitimate email to me.
      - pasc1878 5y ago
        If there was no filtering how many spammessages would you receive? I suspect any more than you see
        d110af5ccf 5y ago
        Those aren't silently dropped though, are they? The sending server is notified I think.
        greenyoda 5y ago
        Yeah, there's a lot of spam out there. My employer's spam filtering software used to send out weekly statistics telling us what percentage of incoming e-mails (across the entire company) were spam. The spam percentage was remarkably constant from week to week: about 90% of all incoming e-mail was spam!
        thaumasiotes 5y ago
        Who cares? The only things that make it into my spam folder are obvious spam. Meanwhile, messages from people I know personally aren't even delivered at all. There is no way to characterize this as reasonable or even acceptable. Google is using metrics that are not related to whether an email should be delivered. They need to tune whatever they're doing down to the point that legitimate personal communication at least shows up in the spam folder. If a lot more spam shows up in the spam folder too, so what? A spam folder that contains mostly spam and also some misclassified personal messages is significantly better than a spam folder that contains nothing but spam because it automatically dropped your misclassified personal messages.
- blendergeek 5y ago
  I should receive 100% of messages from numbers I message. If my carrier wants to helpfully filter my other messages, I should be able to opt out.
techrat 5y ago
I ran into this recently even on Facebook Messenger. A friend of mine was hunting for a short domain name and I had a list of some three character .net and .org domains I recently had found that were available. Cut and pasted the list and the message wouldn't send. Narrowed it down to one. Typed just the bare domain. Wouldn't go through. (It was something incredibly benign like n17.org) Couldn't find a history on that domain name for why it would have been filtered. At least messenger responded with 'couldn't send message' but still no clue as to why... and it took me sending each domain name individually until I found the one that was failing the entire message.
- Symbiote 5y ago
  If it was N26, that's a European bank so I could see similar domains being used in phishing scms.
- aaaaaaaaaaab 5y ago
  >and it took me sending each domain name individually until I found the one that was failing the entire message. A true hacker would have used binary search ;)
  - afurculita 5y ago
    Or a distributed ElasticSearch

Thaxll 5y ago

You wonder why there is any filtering on sms ...

Spivak 5y ago
Because spam really is that rampant. There aren't that many communication systems with a small search domain of user ids where anyone can send and receive messages from anyone by default.
- maxwell 5y ago
  Why not impose costs instead of filtering?
  - indymike 5y ago
    They do.
  - SilverRed 5y ago
    The latest spam method right now is to get malware on to android phones and have the actual phones do the spamming. So if there is a cost, it gets applied to random people and not the spammers. Also if there was a cost per SMS on phones these days it would be the death of SMS because no other system charges.
- Thaxll 5y ago
  Makes sense, but then they just blacklist entire TLD, it's a bit weird.

kop316 5y ago

...whoa, yeah same here. tried "test spot.xyz" then "test spot.com" T-mobile <-> T-Mobile. "test spot.xyz" did not send. Even weirder, I got a confirmmation that it was delivered. It looks like T-Mobile looks for ".xyz" within the SMS and will silent drop the SMS (though it will claim it is delivered). ".xxyz" works, "..xyz" or ".xyzz" does not. "xyz" works, so does ".xy".

DaiPlusPlus 5y ago
> though it will claim it is delivered I thought SMS didn’t have delivery receipts?
- kop316 5y ago
  They certainly do. In Chatty: https://source.puri.sm/Librem5/chatty/-/merge_requests/786 https://source.puri.sm/Librem5/chatty/-/merge_requests/786 . Some carriers even charge for the service (!!): https://source.puri.sm/Librem5/chatty/-/issues/434 https://source.puri.sm/Librem5/chatty/-/issues/434 MMS has delivery reports too (I implimented support for it myself for mainline Linux Phones). It even has read reports, but no carrier seems to honor using it (which is why I didn't bother to impliment it). I'm not sure if Android/iOS gives the user an option for it (which may be the source of confusion).
  - frosted-flakes 5y ago
    There is an option to enable delivery receipts on Android (Google and Samsung). I believe it is disabled by default.
    - kop316 5y ago
      Read reciepts or delivery reports? I'm not sure if SMS supports read reciepts, but I didn't think so. The MMS standard allows for read receipts ("MAY" not "SHALL"), I was unable to get it working, and I suspect it's due to no carrier support. I was unable to get read receipts working at all, and I suspect it's because the carrier doesn't impliment it.

krono 5y ago

Blocking of messages/emails and blanket email server/domain/extension blacklisting is the same as a postal service not delivering mail to or from a particular entity/street/town. Doing so silently and without a valid and case-specific reason should not be legally allowed. Edit: Added "street/town" to analogy, and "case-specific" before reason

maxwell 5y ago
The FCC classified SMS/MMS as unregulated, filterable "information services" rather than regulated "telecommunications services". https://www.fiercewireless.com/wireless/sms-mms-deemed-information-services-removing-them-from-heavier-regulation https://www.fiercewireless.com/wireless/sms-mms-deemed-infor...
- krono 5y ago
  They should really update the "Mission and strategy" chapter on their Wikipedia page [1]. In particular the part about "Protecting Consumers & Public Safety" seems horribly outdated! I will have to look up how this works in the EU and here in The Netherlands. Something to do for the weekend. [1] https://en.wikipedia.org/wiki/Federal_Communications_Commission#Mission_and_strategy https://en.wikipedia.org/wiki/Federal_Communications_Commiss...
- wikidani 5y ago
  I really would like to see what was the legal reason behind that, I know the US has issues with gov't agencies using their opinions as law but I thought mail was constitutionally protected?
  - maxwell 5y ago
    The FCC just makes decisions, we're talking regulations here, not laws. They justified it with "preventing spam" and enabling competition with unregulated OTT apps. I'm glad that Twilio fought for Title II governance: https://ecfsapi.fcc.gov/file/60001324418.pdf https://ecfsapi.fcc.gov/file/60001324418.pdf Where was everyone else? As far as the sanctity of the U.S. Mail, it only applies to sealed envelopes/packages, and Congress can ban items from the mail (e.g. lottery pamphlets, spurious tokens, gasoline, etc.) https://supreme.justia.com/cases/federal/us/96/727/ https://supreme.justia.com/cases/federal/us/96/727/

iconjack 5y ago

It was wild to me too. I have an .xyz domain, which seemed appropriate for a non-commercial math site. I'd try to send links of math experiments to friends and colleagues via SMS, so they could tell me if they worked right on their phones or not. Can't tell you how much confusion and frustration it caused that the links were simply not being delivered, though all the conversation around the links went through just fine. No error was reported on either end. A year or so ago, I did a lot of searching trying to find some explanation of this bizarre behavior, but found literally nothing. It's nice to know I'm not crazy, at least. Is there a published list of what domains are not allowed to go through?

schleck8 5y ago
> which seemed appropriate for a non-commercial math site They are used by large cooperations too. The Alphabet domain is abc.xyz. Science Corp's is science.xyz.
- mhh__ 5y ago
  I didn't know about abc.xyz, that's a really nice URL
  - samspenc 5y ago
    Quite likely only investors in Google / Alphabet stock know that site and have it bookmarked because that's where Alphabet publishes its quarterly earnings. I also guess for the same reason, it only gets significant traffic once a quarter during earnings season.
    - lrem 5y ago
      I like to think of it as Ruth's blog ;)
GoblinSlayer 5y ago
SMS has a delivery confirmation feature, my phone indicates delivered and undelivered messages, so you can tell what wasn't delivered.

Scoundreller 5y ago

If you’re in Canada, and send an SMS containing the string “special message” to or from a Telus customer (or one of their sub-brands), it will be silently dropped. Telus is one of the big3 telecoms here.

drampelt 5y ago
I just tried on Koodo which is part of Telus, no issues sending/receiving
- Scoundreller 5y ago
  Make sure it wasn’t iMessage
  - drampelt 5y ago
    Definitely wasn't iMessage, I tried it on my Android phone

exikyut 5y ago

> Ironically, Google Voice also has the same behavior with abc.xyz. This is my new mini-favorite thing. It feels a bit like a redux of "Shirt without stripes" (https://news.ycombinator.com/item?id=22925087 https://news.ycombinator.com/item?id=22925087)...

tiffanyh 5y ago

I wish the Telco's did MORE filtering given the huge amount of SMS spam I get since Twilio has turned this channel into a positive ROI for spammers. (1st biggest spam channel being email, which surprise/surprise - Twilio also dominates via SendGrid)

aquark 5y ago
I have no knowledge of the ROI involved here, but would love to understand this: Twilio is 0.75c to send a text. Is it possible for a spammer to generate >$75 per 10,000 people spammed? I've no idea were the SMS spams I've got link to (not about to find out) but they are so obviously spam. We use SMS for communicating with users and would be happy to more a lot more per text to escape the 'positive ROI for spammers' territory. I'd be happy to do that for important emails too!
- mmerlin 5y ago
  Probably decent ROI which is why it keeps on happening! They just need one person in each 10k spammed on average, to click the phishing url asking them to pay a fake bill and then charge them $328 instead of the $3.28 displayed o the page. I received (and reported to their scam Dept) a phishing SMS yesterday pretending to be from Australia Post asking for $3.28 to release a delivery package I'm waiting for, which is most people in Australia nowadays with the current slowdown in mail delivery speed. I am only guessing that the $3.28 phishing purchase would have attempted a $328 charge on my card... but that would be wildly profitable if the input costs per successful fraud were under $100...
callalex 5y ago
How did you determine that these messages are through Twilio and not one of the dozens of cheap unscrupulous knockoffs? This is very easily identified, and you are are slinging serious accusations.

petercooper 5y ago

Related thing from the past.. Gmail once had a bug(?) where if you sent any email containing a URL with the domain starting "0x", it would go straight to spam. I imagine it was a rule hard coded to block the use of hexadecimal long IP URLs, but it also picked regular domains starting 0x. It was fixed a few years ago.

ArchOversight 5y ago
I own a domain starting with 0x and I spent a lot of time talking to people I knew at Google to get that one fixed because my mail would not be delivered.
- petercooper 5y ago
  I'm glad to hear another first hand report of this as info was very thin on the ground at the time!

foofoo4u 5y ago

A lot of systems block anything by default that isn't standard. For example, if you happen to own a domain to serve as your email that doesn't end in .com, .edu, .gov, then many systems will instantly invalidate you saying you don't have a valid email when in reality you do. A lot of companies or programmers don't seem to realize that its 2021 where we have hundreds of domain extensions to choose from.

devoutsalsa 5y ago
I had a .ninja domain for a while, and I had to contact a certain DNS provide to add support for that TLD. They were very responsive, but I still had to ask.
SilverRed 5y ago
I think this mostly applies to TLDs with more than 3 letters. I have email on a .me and a .red and I have never had anything reject me.
kayodelycaon 5y ago
No issues with my .co domain.

sytelus 5y ago

I am pretty sure this is not intentional. Somewhere some classifier in Google has overfitted onto .xyz. They will probably fix that some day so this will not be true forever either.

tambeb 5y ago

I just tested example.xyz and spot.xyz between my Google Fi and Voice numbers and both were fine.

pacman2 5y ago

Pff. That is nothing. Try to run your own mailserver and deliver a mail to a t-online.de address (T Mobile Germany). They basically only accept pre-approved providers. If your have your own domain and infrastructure you have to petition them to whitelist you. Totally insane. If you can read German, this guy who runs a shop decided to block himself all of t-online emails since they basically run email out of specification. https://blog.rolandmoriz.de/2020/09/21/t-online-blockiert-mails-fuer-kunden/ https://blog.rolandmoriz.de/2020/09/21/t-online-blockiert-ma...