Problem relaying two domain to same internal IP

[BelluX]

Hi,

i'm having problem relaying two mail domain with pmg to a single internal IP address.

Without PMG, the server is receiving correctly the emails for the two domain.

I see that PMG is receiving correctly the mails for the second domain but is not relaying to the server.

What im missing?

2025-04-16T16:58:06.233593+02:00 pmg postfix/lmtp[10661]: 6389E2401DB: to=<management@######.it>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.86, delays=0.08/0.02/0.04/0.72, dsn=2.5.0, status=sent (250 2.5.0 OK (2401DC67FFC57D7E5DF))
2025-04-16T16:58:06.234661+02:00 pmg postfix/qmgr[8441]: 6389E2401DB: removed
2025-04-16T16:58:06.290342+02:00 pmg postfix/smtp[10667]: 2C6FC2401DD: to=<management@######.it>, relay=10.0.0.200[10.0.0.200]:25, delay=0.11, delays=0.05/0.02/0.03/0.01, dsn=5.1.1, status=bounced (host 10.0.0.200[10.0.0.200] said: 550 5.1.1 <management@######.it>: Recipient address rejected: undeliverable address: lookup failed (in reply to RCPT TO command))
2025-04-16T16:58:06.295916+02:00 pmg postfix/qmgr[8441]: 2C6FC2401DD: removed

the account exists, the server is receiving without proxmox mail gateway, we don't understand why is saying recipient address rejected.

 

[Stoiko Ivanov]

10.0.0.200[10.0.0.200] said: 550 5.1.1 <management@######.it>: Recipient address rejected: undeliverable address: lookup failed

This says, that 10.0.0.200 (I guess your mailserver) says that management@######.it is not deliverable
-> check the logs of 10.0.0.200

I hope this helps!