On 19.06.19 12:37, Ralf Hildebrandt wrote:
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)

really strange, since both 250 and 2.1.5 are successful error codes.
do you have anything non-standard in transport maps?

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

--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
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- Elementary, Watson.  -- Daffy Duck & Porky Pig

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