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LordJ · #1 7th July 2011, 19:04

Hi Guys,

A couple days ago I realized that are mail server is sending spam. I have checked and we are not an open relay either. How do I stop this? I've been trying to change the sender_access, client_access and even try to block them by the OSfirewall but nothing is working. The spam domain is yahoo.com.tw and
as of right now there are 3 spam addresses that are using are resources.

xmnof@yahoo.com.tw
jdihq@yahoo.com.tw
dmknl@yahoo.com.tw

Here are some logs:

Jul 7 09:56:33 iosmail postfix/error[29968]: 8AFD51107E9: to=<ud88882003@yahoo.com.tw>, relay=none, delay=171507, delays=171502/3.6/0/0.97, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[30001]: 8D34E11055A: to=<z6862339@yahoo.com.tw>, relay=none, delay=63369, delays=63364/3.4/0/1.5, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29959]: 86B3A110730: to=<q510210@yahoo.com.tw>, relay=none, delay=205615, delays=205611/3.8/0/0.77, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29941]: 86935B7E0A: to=<ruby77425@yahoo.com.tw>, relay=none, delay=42248, delays=42243/3.5/0/1.3, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[30016]: 83B07B7D2A: to=<ydvp04@yahoo.com.tw>, relay=none, delay=75905, delays=75900/3.5/0/1.3, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29972]: 80779110B65: to=<mu64081799@yahoo.com.tw>, relay=none, delay=13798, delays=13793/3.5/0/1.1, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<grilfriendcute@yahoo.com.tw>, relay=none, delay=59108, delays=59104/3.9/0/0.45, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<l860413@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/0.59, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29959]: 86B3A110730: to=<slight_dew@yahoo.com.tw>, relay=none, delay=205615, delays=205611/3.8/0/0.85, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29972]: 80779110B65: to=<summer6858@yahoo.com.tw>, relay=none, delay=13798, delays=13793/3.5/0/1.2, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<guessphone@yahoo.com.tw>, relay=none, delay=59109, delays=59104/3.9/0/0.53, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<jenny999942003@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/0.53, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29946]: 8AE01110A53: to=<jennylo19811223@yahoo.com.tw>, relay=none, delay=117842, delays=117838/3.9/0/0.67, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29992]: 7C28F110FC6: to=<wowdc@yahoo.com.tw>, relay=none, delay=63331, delays=63324/6/0/1.2, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred - 4.16.55.1; see http://postmaster.yahoo.com/errors/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<liu2pp@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/0.67, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29968]: 8AFD51107E9: to=<waxpom@yahoo.com.tw>, relay=none, delay=171507, delays=171502/3.6/0/1, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<loveyoyo0622@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/0.73, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29946]: 8AE01110A53: to=<linzi0407@yahoo.com.tw>, relay=none, delay=117842, delays=117838/3.9/0/0.73, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<ha_ryhu8mte@yahoo.com.tw>, relay=none, delay=59109, delays=59104/3.9/0/0.59, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<l27073655@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/0.59, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29972]: 80779110B65: to=<yoyo52049@yahoo.com.tw>, relay=none, delay=13798, delays=13793/3.5/0/1.3, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29959]: 86B3A110730: to=<vw640915@yahoo.com.tw>, relay=none, delay=205615, delays=205611/3.8/0/0.91, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29959]: 86B3A110730: to=<wonderful_life_80@yahoo.com.tw>, relay=none, delay=205615, delays=205611/3.8/0/0.96, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<higphi@yahoo.com.tw>, relay=none, delay=59109, delays=59104/3.9/0/0.64, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<pawen0421@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/0.78, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<ping_0329@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/0.64, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29946]: 8AE01110A53: to=<yeah104@yahoo.com.tw>, relay=none, delay=117842, delays=117838/3.9/0/0.79, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29946]: 8AE01110A53: to=<yihsing59@yahoo.com.tw>, relay=none, delay=117842, delays=117838/3.9/0/0.96, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<jearcher1115@yahoo.com.tw>, relay=none, delay=59109, delays=59104/3.9/0/0.82, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user c from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<pupustore@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/0.82, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<tholy999@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/0.96, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29999]: 8C38E110AF2: to=<virginia0912768855@yahoo.com.tw>, relay=none, delay=59109, delays=59104/3.9/0/0.97, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<v76327@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/1.1, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<radiolikevivian@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/0.97, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29942]: 8AA13110775: to=<victor651107@yahoo.com.tw>, relay=none, delay=126170, delays=126166/3.8/0/1, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:56:33 iosmail postfix/error[29996]: 8F4B4110841: to=<winer3663@yahoo.com.tw>, relay=none, delay=193214, delays=193209/3.8/0/1.2, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:29 iosmail postfix/cleanup[30078]: 14605B7DC4: hold: header Received: from vjdzax.com (static-50-102-242-182.ekht.in.frontiernet.net [50.102.242.182])??by iosmail.interoceansystems.com (Postfix) with ESMTPA id 14605B7DC4;??Thu, 7 Jul 2011 09:57:27 -0700 (PDT) from static-50-102-242-182.ekht.in.frontiernet.net[50.102.242.182]; from=<dmknl@yahoo.com.tw> to=<choc1067@yahoo.com.tw> proto=ESMTP helo=<vjdzax.com>
Jul 7 09:57:35 iosmail postfix/qmgr[17623]: A021AB7DC6: from=<dmknl@yahoo.com.tw>, size=3115, nrcpt=11 (queue active)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<aabbabc7725@yahoo.com.tw>, relay=none, delay=7.5, delays=7.4/0.06/0/0.08, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<caroline1128@yahoo.com.tw>, relay=none, delay=7.5, delays=7.4/0.06/0/0.12, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<choc1067@yahoo.com.tw>, relay=none, delay=7.6, delays=7.4/0.06/0/0.17, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<kulyil@yahoo.com.tw>, relay=none, delay=7.6, delays=7.4/0.06/0/0.2, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<ling5961@yahoo.com.tw>, relay=none, delay=7.7, delays=7.4/0.06/0/0.25, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<q0919088077@yahoo.com.tw>, relay=none, delay=7.7, delays=7.4/0.06/0/0.29, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<s124323935@yahoo.com.tw>, relay=none, delay=7.8, delays=7.4/0.06/0/0.33, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<skyalan001@yahoo.com.tw>, relay=none, delay=7.8, delays=7.4/0.06/0/0.38, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<sosyoyo7119@yahoo.com.tw>, relay=none, delay=7.8, delays=7.4/0.06/0/0.42, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:35 iosmail postfix/error[30005]: A021AB7DC6: to=<twos06@yahoo.com.tw>, relay=none, delay=7.9, delays=7.4/0.06/0/0.47, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)
Jul 7 09:57:39 iosmail postfix/error[30006]: 50E49B7DC4: to=<dmknl@yahoo.com.tw>, relay=none, delay=0.49, delays=0.16/0.06/0/0.28, dsn=4.7.0, status=deferred (delivery temporarily suspended: host mx1.mail.tw.yahoo.com[203.188.197.119] refused to talk to me: 421 4.7.0 [TS01] Messages from 65.44.202.18 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html)

The reason why I assume my server is sending spam is because we are using AWStats and it shows the those 3 addresses have sent over 40k messages in the last 7 days.

Any help is greatly appreciated.

LordJ · #2 7th July 2011, 19:34

Hey Guys,

Had a major breakthrough. I was doing some more research and I learned about SMTP Auth Relay Attacks. I found this article extremely helpful.

http://ezinearticles.com/?Easy-Steps...fix&id=5744562

I did a cat/grep on my maillogs for sasl_username and found out that a test account had been compromised.

I'll keep you guys posted but I feel confident that I have stopped this problem.

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