Hallo,
I did wonder for a few month why we can not send mails to Hotmail an few differnt clients. We are not listet on any RBLs or other blacklists.
No I did send a Mail to my own Linux SMTP-Host and did take a look to the mail.info log.
The Problem is, if we use Astaro as Smarthost the SMTP-Proxy on the Astaro will change the sender Address from username@domain.tld to username/4a7438a3764@domain.tld (the 4a7438a3764 is different for each sender address) so few SMTP hosts we tried to deliver messages to did discard our mails because of non existing senders.
Now I switcht to direct delivery without using Astaro for outgoing Mails. But this is a dirty solution.
Does anyone know whats up in this case?
Thanks.
HuGO
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