This is the maillog result of the grep, but i dont see IP address etc (not sure if the actual log got deleted when i removed the big log).

Jun 16 13:21:49 ml postfix/pickup[23232]: 0C9B14166A: uid=5005 from=<cdbphlavjop...@wysina.com.tw> Jun 16 13:21:49 ml postfix/cleanup[20077]: 0C9B14166A: message-id=<kflvqedfdosxjjhkebewy...@sfilc.com> Jun 16 13:21:49 ml postfix/qmgr[9205]: 0C9B14166A: from=<cdbphlavjop...@wysina.com.tw>, size=7886, nrcpt=14 (queue active) Jun 16 13:24:06 ml postfix/error[21508]: 0C9B14166A: to=<0...@yahoo.com.tw>, relay=none, delay=138, delays=0.02/137/0/0.76, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:07 ml postfix/error[21508]: 0C9B14166A: to=<1...@yahoo.com.tw>, relay=none, delay=139, delays=0.02/137/0/1.6, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:08 ml postfix/error[21508]: 0C9B14166A: to=<1...@yahoo.com.tw>, relay=none, delay=140, delays=0.02/137/0/2.6, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:09 ml postfix/error[21508]: 0C9B14166A: to=<4...@yahoo.com.tw>, relay=none, delay=141, delays=0.02/137/0/3.8, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:10 ml postfix/error[21508]: 0C9B14166A: to=<8...@yahoo.com.tw>, relay=none, delay=142, delays=0.02/137/0/4.7, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:11 ml postfix/error[21508]: 0C9B14166A: to=<a9559jt955...@yahoo.com.tw>, relay=none, delay=143, delays=0.02/137/0/5.6, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out) Jun 16 13:24:12 ml postfix/error[21508]: 0C9B14166A: to=<abba...@yahoo.com.tw>, relay=none, delay=143, delays=0.02/137/0/6.5, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out)

For now i have stopped all ports and with nothing coming thru logs are silent (no mails going thru though :)), need to figure out and slowly open and see

On Tue, 16 Jun 2015 16:11:38 -0700, Wietse Venema <wie...@porcupine.org> wrote:

Jithesh AP:
unfortunately have logs of messages generating like the below (snippet
 from postqueue -p)

0C9B14166A     7886 Tue Jun 16 13:21:49  cdbphlavjop...@wysina.com.tw
(delivery temporarily suspended: connect to
mx-tw.mail.gm0.yahoodns.net[203.188.197.119]:25: Connection timed out)
                                          0...@yahoo.com.tw
                                          1...@yahoo.com.tw
                                          1...@yahoo.com.tw

Did Postfix RECEIVE this mail with SMTP? What IP address
was logged as the origin?

Did Postfix RECEIVE this mail with the pickup daemon? What userID
was logged as the origin?

$ grep 0C9B14166A /the/maillog/file | head

        Wietse


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