debian trixie, postfix 3.10.5-1~deb13u1
sender -> m0 -> psg.com
m0 is relaying recipients in bogus.com to psg.com, but should drop
unknown users. psg.com is correctly 550ing an unknown user
m0.rg.net:/home/randy> telnet psg.com 25
Trying 2001:418:1::62...
Connected to psg.com.
Escape character is '^]'.
220 psg.com ESMTP Exim 4.98.2 Thu, 09 Apr 2026 23:47:06 +0000
EHLO m0.rg.net
250-psg.com Hello m0.rg.net [2001:418:3807::22]
250-SIZE 209715200
250-LIMITS MAILMAX=6 RCPTMAX=50000
250-8BITMIME
250-PIPELINING
250-PIPECONNECT
250-STARTTLS
250 HELP
MAIL FROM: [email protected]
250 OK
RCPT TO: [email protected]
550 unknown user
but then postfix seems to be telling the sender to retry later 450.
2026-04-09T23:15:36.547760+00:00 m0 postfix/smtpd[4892]: NOQUEUE: reject:
RCPT from
mail-australiaeastazrln10220002.outbound.protection.outlook.com[52.103.200.2]:
450 4.1.1 <[email protected]>: Recipient address rejected: unverified address:
delivery temporarily suspended: connect to psg.com[147.28.0.62]:25: Connection
timed out; from=<[email protected]> to=<[email protected]> proto=ESMTP
helo=<SY8PR01CU002.outbound.protection.outlook.com>
the only think i can think of is
m0.rg.net:/etc/postfix# cat /etc/rspamd/local.d/greylist.conf
whitelisted_ip = /etc/rspamd/whitelist
enabled = true;
randy
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