Pigeonhole Sieve Vacation Reply-To peculiarity with inbound AWS-SES

Dr. Rolf Jansen rj at cyclaero.com
Tue Feb 7 21:07:24 UTC 2023

> Am 07.02.2023 um 17:54 schrieb jeremy ardley <jeremy at 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

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