I have Self-Serivce (univention.com/2015/12/self … n-ucs-4-1/) portal to recovery my password for all users. My UCS Master instance is setup in Amazon AWS / EC2 and until month ago all was working fine with sending a mail. Now UCS could not connect to gmail - my mail domain/server. Probably Amazon block some connection to this SMTP. I have done some research and all suggestion are point to SES in Amazon.
My question is: Do you know how to setup USC Postfix to use SES Server like a Relay host? Or maybe there is different possibility to setup it?
I’d suggest to investigate in the usual Postfix logs whats not working anymore.
In case you need to configure outbound sending through a relay: 13.8.1. Configuration of a relay host for sending the e-mails. I’d guess that this would be necessry for SES too.