I have a strange problem with mails to GMAIL. A user sent out mails to 90 recipients, half of which are @gmail.com, and those mostly bounced:
Jun 19 09:52:43 mail-cvk postfix/smtp[32063]: 45THH93PXyz1Z4Kq: to=<malgorzata.ixxx...@gmail.com>, relay=gmail-smtp-in.l.google.COM[173.194.76.26]:25, delay=4.8, delays=3.3/0.04/0.62/0.84, dsn=5.5.0, status=bounced (Protocol error: host gmail-smtp-in.l.google.COM[173.194.76.26] said: 250 2.1.5 OK w9si551343wmd.47 - gsmtp (in reply to DATA command)) Jun 19 09:52:43 mail-cvk postfix/smtp[32063]: 45THH93PXyz1Z4Kq: to=<maxxxxxch.hxx...@gmail.com>, relay=gmail-smtp-in.l.google.COM[173.194.76.26]:25, delay=4.8, delays=3.3/0.04/0.62/0.84, dsn=5.5.0, status=bounced (Protocol error: host gmail-smtp-in.l.google.COM[173.194.76.26] said: 250 2.1.5 OK w9si551343wmd.47 - gsmtp (in reply to DATA command)) The error message says: Protocol error: host gmail-smtp-in.l.google.COM[173.194.76.26] said: 250 2.1.5 OK w9si551343wmd.47 - gsmtp (in reply to DATA command) Other recipients were @yahoo.com, and some even hosted on google (uniroma1.it): Jun 19 09:52:42 mail-cvk postfix/smtp[32079]: 45THH93PXyz1Z4Kq: to=<mxxxo.fxxxx...@uniroma1.it>, relay=ASPMX.L.GOOGLE.COM[173.194.76.27]:25, delay=4.7, delays=3.3/0.44/0.42/0.58, dsn=2.0.0, status=sent (250 2.0.0 OK 1560930762 l7si9891184wrx.266 - gsmtp) Jun 19 09:52:44 mail-cvk postfix/smtp[32063]: 45THH93PXyz1Z4Kq: to=<tanja.mxxxxovi...@gmail.com>, relay=alt1.gmail-smtp-in.l.google.COM[108.177.14.26]:25, delay=6.7, delays=3.3/0.04/2.9/0.44, dsn=2.0.0, status=sent (250 2.0.0 OK 1560930764 q30si13988623lfb.86 - gsmtp) so the answer "250 2.0.0 OK 1560930762 l7si9891184wrx.266 - gsmtp" is acceptable, while "250 2.1.5 OK w9si551343wmd.47 - gsmtp" is a protocol error? https://tools.ietf.org/html/rfc3463 says about the extended code 2.1.5: 2.XXX.XXX Success X.1.5 Destination address valid -- [*] sys4 AG https://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
