I'm having zero luck finding a solution to this issue so I'm guessing I'm missing something obvious. Hopefully you guys can steer me in the right direction.

 

I have a customer receiving mail from someone using amazonses. I get the emails just fine in gmail but smartermail just rejects them. Here is an SMTP log entry:

 

[2018.05.16] 12:40:51 [54.240.8.76][10306202] rsp: 220 mail.skynet-solutions.net
[2018.05.16] 12:40:51 [54.240.8.76][10306202] connected at 5/16/2018 12:40:51 PM
[2018.05.16] 12:40:51 [54.240.8.76][10306202] cmd: EHLO a8-76.smtp-out.amazonses.com
[2018.05.16] 12:40:51 [54.240.8.76][10306202] rsp: 250-mail.skynet-solutions.net Hello [54.240.8.76]250-SIZE 31457280250-AUTH LOGIN CRAM-MD5250-STARTTLS250-8BITMIME250 OK
[2018.05.16] 12:40:51 [54.240.8.76][10306202] cmd: STARTTLS
[2018.05.16] 12:40:51 [54.240.8.76][10306202] rsp: 220 Start TLS negotiation
[2018.05.16] 12:40:51 [54.240.8.76][10306202] cmd: EHLO a8-76.smtp-out.amazonses.com
[2018.05.16] 12:40:51 [54.240.8.76][10306202] rsp: 250-mail.skynet-solutions.net Hello [54.240.8.76]250-SIZE 31457280250-AUTH LOGIN CRAM-MD5250-8BITMIME250 OK
[2018.05.16] 12:40:51 [54.240.8.76][10306202] cmd: MAIL FROM:<010001636a0a519b-dafb1a9c-375a-4686-86d5-575d64e72006-000000@amazonses.com>
[2018.05.16] 12:40:51 [54.240.8.76][10306202] rsp: 550 Sender is not allowed.
[2018.05.16] 12:40:51 [54.240.8.76][10306202] disconnected at 5/16/2018 12:40:51 PM

 

What is causing this?