Ralf Hildebrandt:
> 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))
Perhaps they messed up their SMTP command pipelining implementation.
Workaround:
/etc/postfix/main.cf:
smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter
/etc/postfix/smtp_dsn_filter:
/^5(\.5\.0 Protocol error: .+ in reply to DATA command.+)/ 4$1
This way some deliveries will be delayed instead of bounced.
We could use debug_peer_list=google.com to make a recording (with
debug_peer_level=1).
Wietse
