Hello, 

I'm facing a timeout issue on one of my server, which seems to slow message
delivery. 
There is a 30s (exactly 30s) delay while connecting to gmail, gandi,
yahoo... servers. But some others haven't this timeout. 

Here is a sample from my logs : 

Dec 18 09:07:48 sd-60799 postfix/pickup[849]: 139BE14807C9: uid=5006
from=<return-p...@domain.fr>
Dec 18 09:07:48 sd-60799 postfix/cleanup[17799]: 139BE14807C9:
message-id=<3d4392ef4ad70960c75529f111477...@domain.fr>
Dec 18 09:07:48 sd-60799 opendkim[24185]: 139BE14807C9: DKIM-Signature
header added (s=selector, d=domain.fr)
Dec 18 09:07:48 sd-60799 postfix/qmgr[18453]: 139BE14807C9:
from=<return-p...@domain.fr>, size=1144, nrcpt=1 (queue active)
Dec 18 09:07:48 sd-60799 postfix/smtpd[17805]: connect from
localhost[127.0.0.1]
Dec 18 09:07:48 sd-60799 postfix/smtpd[17805]: 4176314805C0:
client=localhost[127.0.0.1]
Dec 18 09:07:48 sd-60799 postfix/auth-cleanup/cleanup[17807]: 4176314805C0:
message-id=<3d4392ef4ad70960c75529f111477...@domain.fr>
Dec 18 09:07:48 sd-60799 postfix/smtpd[17805]: disconnect from
localhost[127.0.0.1]
Dec 18 09:07:48 sd-60799 postfix/qmgr[18453]: 4176314805C0:
from=<return-p...@domain.fr>, size=1402, nrcpt=1 (queue active)
Dec 18 09:07:48 sd-60799 amavis[25958]: (25958-13) Passed CLEAN
{RelayedOpenRelay}, <return-p...@domain.fr> -> <m...@gmail.com>, Message-ID:
<3d4392ef4ad70960c75529f111477...@domain.fr>, mail_id: 7IqjWUZVzS5m, Hits:
-, size: 1495, queued_as: 4176314805C0, 144 ms
Dec 18 09:07:48 sd-60799 postfix/smtp[17803]: 139BE14807C9:
to=<m...@gmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.27,
delays=0.11/0.01/0/0.15, dsn=2.0.0, status=sent (250 2.0.0 from
MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 4176314805C0)
Dec 18 09:07:48 sd-60799 postfix/qmgr[18453]: 139BE14807C9: removed
Dec 18 09:08:08 sd-60799 postfix/smtpd[2290]: connect from
localhost[127.0.0.1]
Dec 18 09:08:08 sd-60799 postfix/smtpd[2290]: disconnect from
localhost[127.0.0.1]
Dec 18 09:08:18 sd-60799 postfix/smtp[17808]: connect to
gmail-smtp-in.l.google.com[2a00:1450:400c:c00::1a]:25: Connection timed out
Dec 18 09:08:19 sd-60799 postfix/smtp[17808]: 4176314805C0:
to=<m...@gmail.com>, relay=gmail-smtp-in.l.google.com[173.194.78.26]:25,
delay=31, delays=0.04/0.01/30/0.56, dsn=2.0.0, status=sent (250 2.0.0 OK
1418890099 q6si12097068wiz.104 - gsmtp)
Dec 18 09:08:19 sd-60799 postfix/qmgr[18453]: 4176314805C0: removed

I first thought it may be greylisting, but on my others servers, this issue
doesn't appears. 
Any idea of what I could have done wrong ?

Thanks !
Regards, 

Hugo H




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