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> Gmail has stricter requirements for v6 because they assume if you are using v6 then they can leave aside all the bozotic baggage they allow for legacy v4. In

> Gmail has stricter requirements for v6 because they assume if you are using v6 then they can leave aside all the bozotic baggage they allow for legacy v4. In particular, your sending IP must have a PTR record and the name in that PTR record must have a AAAA record containing that address. This is, in fact, quite difficult to convince your ISP they should do.

jeffbee 4y ago
Round-trip DNS consistency is pretty basic and my ISP provides it by default. Note that I didn't say your ISP has to delegate to you, or that your PTR record needs to match your EHLO or anything of that nature.
vajrabum 4y ago
Are IPv6 numbers not available from your local registry at low or no cost? Or in these late days must you rent them? Or is this just a problem of people not wanting or knowing how to run BGP so they can control their own fate?
- navaati 4y ago
  Run BGP... with whom ? Let's say I have my own AS and a prefix given to me, which is indeed quite open and not too costly. If my ISP coming to my facility won't allow me to set a PTR record, they for sure won't allow me to run BGP session with them !
  - icedchai 4y ago
    There are VPS providers out there (like Vultr) that offer BGP. You can either use the IPs on their cloud instances, or tunnel IPs back to your home network, etc.
    - gunapologist99 4y ago
      Vultr is actually really awesome. (And highly unusual in their BGP support!)
- nybble41 4y ago
  You're supposed to get your IPv6 prefix from your ISP's allocation, not directly from the regional registry. Simplifying the routing tables with hierarchical address assignment was one of the major selling points for the larger address size in IPv6. If everyone gets their own prefix independent from their ISP then the core Internet routing tables will continue to grow ever more complicated.
mschuster91 4y ago
> This is, in fact, quite difficult to convince your ISP they should do. For server hosting, I have never seen a provider that doesn't allow me to either set the PTR record or at the very least keep it set to something that resolves back to the IP address in question. For residential ISPs however the story is different - but who would want to send emails to googlemail from a residential IPv6 address without authenticating themselves? Only spammers would.
- plainolrandy 4y ago
  "Authenticating themselves" to who? This, to me, is just another way of saying "residential users must use an approved sender and can't send mail themselves" since residential users will statistically never be able to get PTRs changed to their domain and instead will have to deal with them pointing to the ISP. It's another way to force people to use the handful of approved providers to send mail and it's really shitty.
  - zinekeller 4y ago
    I'm sure you'll disagree with me but if you're running a computer with an ephemeral address it's very very likely that you're not intending to send mail but instead it's a malicious program unknowingly installed flogging mail, and if you're ISP doesn't provide a static address with PTR chances are that they're also negligent to the point that they're blocked by even the smaller providers simply due to too much spam.
  - Avamander 4y ago
    > It's another way to force people to use the handful of approved providers to send mail and it's really shitty. There are so many and cheap ways to have a matching PTR, so really not really. The majority of mail from residential ranges is spam and has been for a long time. It's unlikely to change at this point.
  - mschuster91 4y ago
    > It's another way to force people to use the handful of approved providers to send mail and it's really shitty. You can always go and rent a server somewhere in a random datacenter, the lowest of the low VPS providers are at ~5€ a month, and send and receive mail from there. Hardly a "handful of providers". There simply is no alternative to banning sending mail from residential IPs.

jeffbee 4y ago

Round-trip DNS consistency is pretty basic and my ISP provides it by default. Note that I didn't say your ISP has to delegate to you, or that your PTR record needs to match your EHLO or anything of that nature.

vajrabum 4y ago

Are IPv6 numbers not available from your local registry at low or no cost? Or in these late days must you rent them? Or is this just a problem of people not wanting or knowing how to run BGP so they can control their own fate?

navaati 4y ago
Run BGP... with whom ? Let's say I have my own AS and a prefix given to me, which is indeed quite open and not too costly. If my ISP coming to my facility won't allow me to set a PTR record, they for sure won't allow me to run BGP session with them !
- icedchai 4y ago
  There are VPS providers out there (like Vultr) that offer BGP. You can either use the IPs on their cloud instances, or tunnel IPs back to your home network, etc.
  - gunapologist99 4y ago
    Vultr is actually really awesome. (And highly unusual in their BGP support!)
nybble41 4y ago
You're supposed to get your IPv6 prefix from your ISP's allocation, not directly from the regional registry. Simplifying the routing tables with hierarchical address assignment was one of the major selling points for the larger address size in IPv6. If everyone gets their own prefix independent from their ISP then the core Internet routing tables will continue to grow ever more complicated.

mschuster91 4y ago

> This is, in fact, quite difficult to convince your ISP they should do. For server hosting, I have never seen a provider that doesn't allow me to either set the PTR record or at the very least keep it set to something that resolves back to the IP address in question. For residential ISPs however the story is different - but who would want to send emails to googlemail from a residential IPv6 address without authenticating themselves? Only spammers would.

plainolrandy 4y ago
"Authenticating themselves" to who? This, to me, is just another way of saying "residential users must use an approved sender and can't send mail themselves" since residential users will statistically never be able to get PTRs changed to their domain and instead will have to deal with them pointing to the ISP. It's another way to force people to use the handful of approved providers to send mail and it's really shitty.
- zinekeller 4y ago
  I'm sure you'll disagree with me but if you're running a computer with an ephemeral address it's very very likely that you're not intending to send mail but instead it's a malicious program unknowingly installed flogging mail, and if you're ISP doesn't provide a static address with PTR chances are that they're also negligent to the point that they're blocked by even the smaller providers simply due to too much spam.
- Avamander 4y ago
  > It's another way to force people to use the handful of approved providers to send mail and it's really shitty. There are so many and cheap ways to have a matching PTR, so really not really. The majority of mail from residential ranges is spam and has been for a long time. It's unlikely to change at this point.
- mschuster91 4y ago
  > It's another way to force people to use the handful of approved providers to send mail and it's really shitty. You can always go and rent a server somewhere in a random datacenter, the lowest of the low VPS providers are at ~5€ a month, and send and receive mail from there. Hardly a "handful of providers". There simply is no alternative to banning sending mail from residential IPs.