Cannot "deliver" SPAM from quarentine

liszca

Well-Known Member
May 8, 2020
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When I try to deliver SPAM E-Mails they get "queued/bounced".
I remember it was once working, how to debug?

This is the message I got from the tracking center after hitting delivery:
Code:
2026-02-27T22:00:57.318006+00:00 mail postfix/smtpd[19353]: connect from localhost[127.0.0.1]
2026-02-27T22:00:57.330755+00:00 mail postfix/smtpd[19353]: 50B212D974: client=localhost[127.0.0.1]
2026-02-27T22:00:57.331522+00:00 mail postfix/cleanup[19356]: 50B212D974: message-id=<000000000000d6e35b064b3b59f7@google.com>
2026-02-27T22:00:57.379629+00:00 mail postfix/smtpd[19353]: disconnect from localhost[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 commands=4
2026-02-27T22:00:57.380032+00:00 mail postfix/qmgr[1980]: 50B212D974: from=<postmaster@mail.example.de>, size=10051, nrcpt=1 (queue active)
2026-02-27T22:00:57.438496+00:00 mail postfix/smtp[19357]: Trusted TLS connection established to 192.168.178.139[192.168.178.139]:25: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519
2026-02-27T22:00:57.504219+00:00 mail postfix/smtp[19357]: 50B212D974: to=<example@example.de>, relay=192.168.178.139[192.168.178.139]:25, delay=0.18, delays=0.06/0.02/0.07/0.03, dsn=5.7.1, status=bounced (host 192.168.178.139[192.168.178.139] said: 554 5.7.1 <example@example.de>: Recipient address rejected: SMTP AUTH is required for users under this sender domain (in reply to RCPT TO command))
2026-02-27T22:00:57.513126+00:00 mail postfix/qmgr[1980]: 50B212D974: removed

At first I thought its because postmaster got the full hostname, but in another Thread I found out that is intentional. How does it have "SMTP AUTH is required ..."?
 
Adding the Proxmox Mail Gateway to the mailservers whitelist helped.

Many thanks for the hints.