Re: IPv6 recap
Alessandro Vesely <[email protected]>
| Newsgroups | gmane.mail.imap.courier.general |
|---|---|
| Message-ID | <[email protected]> |
On Fri 05/Apr/2024 14:08:27 +0200 Sam Varshavchik wrote: > Alessandro Vesely writes: > >> this happened again, but this time caused a bounce: >> >> <<< 554 resimta-c2p-559421.sys.comcast.net >> resimta-c2p-559421.sys.comcast.net 2a02:29e1:500:6c00::4 Comcast requires >> that all mail servers must have a PTR record with a valid Reverse DNS entry. >> Currently your mail server does not fill that requirement. For more >> information, refer to: https://postmaster.comcast.net/smtp-error-codes.php#554 >> >> Is it possible to inhibit use of IPv6 a little bit harder? > > Can you block all IPv6 connections to port 25 on your firewall? Yes, I could. However, that way I'd lose the possibility to reach IPv6-only MXes (if there are any). If that depends on DNS queries timing, it should be enough to enlarge the timeout a little bit. Is that configurable? Best Ale -- _______________________________________________ courier-users mailing list [email protected] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users