> Am 07.02.2023 um 17:54 schrieb jeremy ardley <jer...@ardley.org>: > > On 7/2/23 22:01, Dr. Rolf Jansen wrote: >> To begin with, usage of Amazons Simple Email Service (SES) is mandatory for >> outgoing mails from AWS-EC2 instances. > > I run AWS-EC2 instances using postfix to send a receive mail. They can send > direct assuming I set up suitable SPF, but they typically forward mail to > another host under my control that is not on AWS to use as the outgoing > server.
OK, that’s another use case. Many do use a full fledged Postfix/Dovecot installation. However the outgoing port 25 into the internet is blocked by AWS, and therefore we may either use a third party relay for our outgoing emails or may use SES, which is not that bad - except some unusual peculiarities. Of course, if I wanted to, I could change, this is something which is under my control. That would however change nothing with the other issue, of my Vacation plugin responding with a nonsense MAIL TO address to third parties using SES, this is not under our control. There is even no channel to argue about it. Best regards Rolf Jansen
