23 May
2019
23 May
'19
4:29 p.m.
I don't have any problems delivering IPv6 originated e-mail to Google. I just made my IPv6 match my IPv4, which means I have IPv4 & IPv6 TXT / SPF / PTR / DMARC records where appropriate, and I sign with DKIM. Works like a champ, roughly half the mail I exchange with Google is over IPv6, the other half over IPv4 (in and out). I've never had to do the PCRE / Transport modification listed earlier in the thread. --Will On 2019/5/23 09:18 , Gert Doering via Outages wrote:
Google is fully intent on making people use IPv4 for SMTP delivery to their MXes.
Lots of silly requirements that are not there on IPv4 (like, must have strong PTRs, SPF, DKIM, ...) - so, BCP today is "just deliver to Google over IPv4".