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Are there really? I don't think I've ever encountered such a service in all the years I've been using an email address under my own domain. And blocking every

Are there really? I don't think I've ever encountered such a service in all the years I've been using an email address under my own domain. And blocking every email address that's not from a big provider means blocking basically everyone who tries to sign up with their company email, which might not be great for business.

xigoi 3mo ago
I recently tried signing up for DeepSeek using my custom-domain e-mail address and the website said the domain is “not supported”.
BiteCode_dev 3mo ago
Yes, espacially exotic tld. I have a ".email" domain name, and I get 2 to 3 instances a year of either rejected forms, or sneakier, just confirmation email that never come until I use a .com address.
- threeio 3mo ago
  I have a 3 character .com as my primary email... it gets rejected more often than I'd like... including at my bank :) I've got a longer more normal domain that I alias, but it annoys me none the less.
  - gerdesj 3mo ago
    Have you got this lot sorted out: MX->A->PTR->A->MX SPF DKIM DMARC mta-sts - DNS and webpage Also your IPs must be squeaky bum clean, ideally for several years. DNSSEC might help too. In the UK getting as far as DKIM is usually enough (plus clean IPs, even FTTC connections will work if static).
lukeify 3mo ago
Within the last month both Mapbox and Etsy blocked my attempts to signup using a Proton Mail alias. How many services do you sign up for in recent years, on average? The practice is becoming incredibly common and more than likely you're just grandfathered in.
- jbxntuehineoh 3mo ago
  are you sure they're not just blacklisting protonmail vs. whitelisting known providers? ime a lot of sites block "temporary" or "anonymous" email providers
- ranger_danger 3mo ago
  Etsy blocks my entire ISP (I know because my IP rotates almost daily) so I cannot even view their site at all, it just gives me a "you are blocked" page.
dadadad100 3mo ago
Camel camel camel wouldn’t send notifications to my hidden email. Works fine for my regular vanity domain.
kay_o 3mo ago
in asia it is frequent that email domain is a dropdown not a type in
- gerdesj 3mo ago
  Asia is huge. Please be more explicit (if you can).
  - ranger_danger 3mo ago
    I have seen sites in both Japan and China limit signups to not only mobile-only provider-specific email domains, but also IP block everything but domestic mobile traffic as well. Most of those services (mixi was one in particular I remember doing this) stopped this practice close to 20 years ago though, but some still remain. I think it was partly due to the "Galapagos phone" era of pre-smartphones, where each carrier used slightly different mobile web standards (think WAP and custom emoji). Here is a current help page for Mitsubishi UFJ bank that lists approved domains for both desktop and mobile use: https://faq.cr.mufg.jp/mufgcard/detail?id=4402 https://faq.cr.mufg.jp/mufgcard/detail?id=4402 Here is a user complaining (with screenshot) that the mail magazine for tabelog only supports mobile provider email domains: https://king.mineo.jp/reports/13368 https://king.mineo.jp/reports/13368 Another recent one is the login page for gravity.place has a dropdown for country codes (for mobile login) with only 6 options.
  - kay_o 3mo ago
    China, Japan ish are where I have seen it the most. Weibo, Sina you get "Failed registration (mail not supported)" if you enter non-major provider. In china nearly everyone is using qq, 163, 126, sina. Probably >99%
vitally3643 3mo ago
I've been running my own mailserver on a firstnamelastname.com domain for nearly 15 years. As far as I can tell, nobody blocks it. Google sometimes rejects emails where the from address doesn't match the real sending address, which is fair. I guess the first couple of years were rocky, I hadn't figured out DKIM and SPF and all the other blood rituals yet. Back then I got blocked by Steam and banks. But ever since I set up the correct security it's been fine. Been my primary email for a long long time. All my online accounts are tied to it. Incidentally, I also have free and unlimited aliases. But I don't usually bother because I have a rule to route all messages to unknown addresses into a special folder. I can give out any random address at my domain and it will always make it back to me. So much more convenient than logging into the website to generate an alias.
- bb88 3mo ago
  I did that too years ago, but the management of it was kind of annoying. DKIM was just getting introduced when I stopped using it. SPF had controversy. I understand both of those are awesome now. The biggest issue was if your ip address got listed in a RBL (Realtime Blackhole List), and then nobody would talk to you. Some were easy to get off, others were permanent blocks, and I found those to be constantly interfering with the delivery of mail. At least the rejection would usually tell you which RBL blocked you.
  - janc_ 3mo ago
    Most RBLs are scams. No competent mail admin uses them to block mail ever.
    - rufo 3mo ago
      …lots of major mail services do? https://www.fastmail.help/hc/en-us/articles/360060591413-Spam-filtering#process https://www.fastmail.help/hc/en-us/articles/360060591413-Spa... https://senders.yahooinc.com/smtp-error-codes/ https://senders.yahooinc.com/smtp-error-codes/ https://www.xfinity.com/support/articles/email-errors https://www.xfinity.com/support/articles/email-errors
ranger_danger 3mo ago
https://sys.4chan.org/signin https://sys.4chan.org/signin has a short list of approved email domains: > Allowed domains are: gmail.com, hotmail.com, yahoo.com, proton.me, protonmail.com, outlook.com, live.com, icloud.com, yandex.com, tutanota.com, tutamail.com, tuta.io
port11 3mo ago
I know a few. Heck, I’ve worked at such a place, we strictly checked MX records to make sure the email would be reachable, and catch-alls usually wouldn’t pass validation. (I’m not saying we should have been doing that, but the company was in insurance and wanted to be extra extra sure.)

xigoi 3mo ago

I recently tried signing up for DeepSeek using my custom-domain e-mail address and the website said the domain is “not supported”.

BiteCode_dev 3mo ago

Yes, espacially exotic tld. I have a ".email" domain name, and I get 2 to 3 instances a year of either rejected forms, or sneakier, just confirmation email that never come until I use a .com address.

threeio 3mo ago
I have a 3 character .com as my primary email... it gets rejected more often than I'd like... including at my bank :) I've got a longer more normal domain that I alias, but it annoys me none the less.
- gerdesj 3mo ago
  Have you got this lot sorted out: MX->A->PTR->A->MX SPF DKIM DMARC mta-sts - DNS and webpage Also your IPs must be squeaky bum clean, ideally for several years. DNSSEC might help too. In the UK getting as far as DKIM is usually enough (plus clean IPs, even FTTC connections will work if static).

lukeify 3mo ago

Within the last month both Mapbox and Etsy blocked my attempts to signup using a Proton Mail alias. How many services do you sign up for in recent years, on average? The practice is becoming incredibly common and more than likely you're just grandfathered in.

jbxntuehineoh 3mo ago
are you sure they're not just blacklisting protonmail vs. whitelisting known providers? ime a lot of sites block "temporary" or "anonymous" email providers
ranger_danger 3mo ago
Etsy blocks my entire ISP (I know because my IP rotates almost daily) so I cannot even view their site at all, it just gives me a "you are blocked" page.

dadadad100 3mo ago

Camel camel camel wouldn’t send notifications to my hidden email. Works fine for my regular vanity domain.

kay_o 3mo ago

in asia it is frequent that email domain is a dropdown not a type in

gerdesj 3mo ago
Asia is huge. Please be more explicit (if you can).
- ranger_danger 3mo ago
  I have seen sites in both Japan and China limit signups to not only mobile-only provider-specific email domains, but also IP block everything but domestic mobile traffic as well. Most of those services (mixi was one in particular I remember doing this) stopped this practice close to 20 years ago though, but some still remain. I think it was partly due to the "Galapagos phone" era of pre-smartphones, where each carrier used slightly different mobile web standards (think WAP and custom emoji). Here is a current help page for Mitsubishi UFJ bank that lists approved domains for both desktop and mobile use: https://faq.cr.mufg.jp/mufgcard/detail?id=4402 https://faq.cr.mufg.jp/mufgcard/detail?id=4402 Here is a user complaining (with screenshot) that the mail magazine for tabelog only supports mobile provider email domains: https://king.mineo.jp/reports/13368 https://king.mineo.jp/reports/13368 Another recent one is the login page for gravity.place has a dropdown for country codes (for mobile login) with only 6 options.
- kay_o 3mo ago
  China, Japan ish are where I have seen it the most. Weibo, Sina you get "Failed registration (mail not supported)" if you enter non-major provider. In china nearly everyone is using qq, 163, 126, sina. Probably >99%

vitally3643 3mo ago

I've been running my own mailserver on a firstnamelastname.com domain for nearly 15 years. As far as I can tell, nobody blocks it. Google sometimes rejects emails where the from address doesn't match the real sending address, which is fair. I guess the first couple of years were rocky, I hadn't figured out DKIM and SPF and all the other blood rituals yet. Back then I got blocked by Steam and banks. But ever since I set up the correct security it's been fine. Been my primary email for a long long time. All my online accounts are tied to it. Incidentally, I also have free and unlimited aliases. But I don't usually bother because I have a rule to route all messages to unknown addresses into a special folder. I can give out any random address at my domain and it will always make it back to me. So much more convenient than logging into the website to generate an alias.

bb88 3mo ago
I did that too years ago, but the management of it was kind of annoying. DKIM was just getting introduced when I stopped using it. SPF had controversy. I understand both of those are awesome now. The biggest issue was if your ip address got listed in a RBL (Realtime Blackhole List), and then nobody would talk to you. Some were easy to get off, others were permanent blocks, and I found those to be constantly interfering with the delivery of mail. At least the rejection would usually tell you which RBL blocked you.
- janc_ 3mo ago
  Most RBLs are scams. No competent mail admin uses them to block mail ever.
  - rufo 3mo ago
    …lots of major mail services do? https://www.fastmail.help/hc/en-us/articles/360060591413-Spam-filtering#process https://www.fastmail.help/hc/en-us/articles/360060591413-Spa... https://senders.yahooinc.com/smtp-error-codes/ https://senders.yahooinc.com/smtp-error-codes/ https://www.xfinity.com/support/articles/email-errors https://www.xfinity.com/support/articles/email-errors

ranger_danger 3mo ago

https://sys.4chan.org/signin https://sys.4chan.org/signin has a short list of approved email domains: > Allowed domains are: gmail.com, hotmail.com, yahoo.com, proton.me, protonmail.com, outlook.com, live.com, icloud.com, yandex.com, tutanota.com, tutamail.com, tuta.io

port11 3mo ago

I know a few. Heck, I’ve worked at such a place, we strictly checked MX records to make sure the email would be reachable, and catch-alls usually wouldn’t pass validation. (I’m not saying we should have been doing that, but the company was in insurance and wanted to be extra extra sure.)