Hello, Sometimes messages are accepted by an MX but undeliverable in later processing. Misconfigured forawarding, User broke it's sieve rules, whatever
In this case the LDA send a DSN back to the sender. But if the sender uses gmail.com, the DSN will never arrive: Aug 13 16:09:15 mta postfix/smtp[105040]: 4GmQQz2MM8zB08wK: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[142.251.5.26]:25, delay=0.26, delays=0.01/0/0.13/0.12, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[142.251.5.26] said: 550-5.7.1 [redacted_ipv4] Messages missing a valid address in From: 550 5.7.1 header, or having no From: header, are not accepted. a185si1555216wme.53 - gsmtp (in reply to end of DATA command)) well, it's postfix that generated this DSN with this RFC5322.From From: MAILER-DAEMON (Mail Delivery System) This wasn't configured by me but is Postfix default since two decades - https://github.com/vdukhovni/postfix/blob/v1.1.0/postfix/src/bounce/bounce_notify_util.c#L268 - https://github.com/vdukhovni/postfix/blob/master/postfix/proto/bounce#L76 Should I really tell my customers "gmail break email" ? I would like to here your opinions. Andreas _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
