On Sep 13, 2013, at 23:51, Mathieu R. <math...@400iso.net> wrote:

> Le 13/09/2013 23:26, Viktor Dukhovni a écrit :
>> If your traffic volume is not too heavy, you can temporarily raise
>> the Postfix SMTP server TLS log level to "2":
>> 
>>      smtpd_tls_loglevel = 2
>> 
>> this will show more details of the TLS handshake.
> 
> not very much more :
> 
> Sep 13 23:33:09 effraie01 postfix/smtpd[25221]: connect from 
> ng4.bullet.mail.bf1.yahoo.com[98.139.164.99]
> Sep 13 23:33:44 effraie01 postfix/smtpd[25221]: SSL_accept error from 
> ng4.bullet.mail.bf1.yahoo.com[98.139.164.99] lost connection
> Sep 13 23:33:44 effraie01 postfix/smtpd[25221]: lost connection after 
> STARTTLS from ng4.bullet.mail.bf1.yahoo.com[98.139.164.99]
> Sep 13 23:33:44 effraie01 postfix/smtpd[25221]: disconnect from 
> ng4.bullet.mail.bf1.yahoo.com[98.139.164.99]

Hmm, we have the same Postfix version, also on Debian, and we are seeing 
disconnects at the postscreen level from that IP address;

==
2013-09-13T23:58:41.766924+02:00 nenya postfix/tlsproxy[3731]: CONNECT from 
[98.139.164.99]:33900
2013-09-13T23:58:47.542529+02:00 nenya postfix/tlsproxy[3731]: DISCONNECT 
[98.139.164.99]:33900
2013-09-13T23:58:47.542674+02:00 nenya postfix/postscreen[3698]: HANGUP after 
35 from [98.139.164.99]:33900 in tests after SMTP handshake
2013-09-13T23:58:47.542682+02:00 nenya postfix/postscreen[3698]: DISCONNECT 
[98.139.164.99]:33900
==

It seems to have been doing that since earlier this evening;

==
2013-09-13T19:33:34.126969+02:00 nenya postfix/postscreen[15218]: HANGUP after 
73 from [98.139.164.99]:39792 in tests after SMTP handshake
2013-09-13T19:52:04.971145+02:00 nenya postfix/postscreen[15218]: HANGUP after 
33 from [98.139.164.99]:30926 in tests after SMTP handshake
2013-09-13T20:01:54.029206+02:00 nenya postfix/postscreen[15218]: HANGUP after 
27 from [98.139.164.99]:42963 in tests after SMTP handshake
2013-09-13T20:12:31.720843+02:00 nenya postfix/postscreen[15218]: HANGUP after 
28 from [98.139.164.99]:46613 in tests after SMTP handshake

[snip]

2013-09-13T23:43:41.362443+02:00 nenya postfix/postscreen[15218]: HANGUP after 
29 from [98.139.164.99]:20120 in tests after SMTP handshake
2013-09-13T23:48:44.737948+02:00 nenya postfix/postscreen[15218]: HANGUP after 
33 from [98.139.164.99]:26140 in tests after SMTP handshake
2013-09-13T23:53:41.682549+02:00 nenya postfix/postscreen[3698]: HANGUP after 
30 from [98.139.164.99]:30328 in tests after SMTP handshake
2013-09-13T23:58:47.542674+02:00 nenya postfix/postscreen[3698]: HANGUP after 
35 from [98.139.164.99]:33900 in tests after SMTP handshake
==

Without delivering anything. Other Yahoo MTAs seem to be fine, it's just this 
one that's showing this particular behaviour as far as I've been able to tell 
from a quick scouring of the logs for Friday.

HTH,
Joni

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