On Thu, Jun 11, 2026 at 05:21:32PM +0200, Victoriano Giralt via Postfix-users wrote:
> Relevant log line: > Jun 11 13:18:46 frontmta postfix/smtpd[1111697]: NOQUEUE: > reject: RCPT from mail.example.net[192.168.0.2]: > 550 5.1.1 <[email protected]>: > Recipient address rejected: undeliverable> address: > host backmta.example.com[172.16.3.14] said: > 550 5.1.0 <[email protected]>: Sender address rejected: > example.com (in reply to RCPT TO command); from=<[email protected]> > to=<[email protected]> proto=ESMTP helo=<mail.example.net> The verification probe sender address is chosen by the "verify" service, which uses "address_verify_sender" and "address_verify_sender_ttl" (if non-zero) to construct the probe envelope-sender address. > [root@frontmta ~]# postconf -n > address_verify_sender = [email protected] Perhaps you have some master.cf settings that override the above main.cf setting (assuming these are from the right Postfix instance). > masquerade_domains = $mydomain > masquerade_exceptions = root, postfix, double-bounce The masquerade_domains setting is a form of wildcard rewriting that is best avoided. If necessary, rewrite specific valid addresses to alternative valid addresses via a fine-grained canonica_maps table. > virtual_maps = hash:/etc/postfix/virtual1 hash:/etc/postfix/virtual2 Best to use "virtual_alias_maps = ..." and to configure any "virtual_alias_domains" explicitly in their own setting. -- Viktor. 🇺🇦 Слава Україні! _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
