IMgate's postfix MTA always logs why an SMTP client sending session didn't 
complete.

For about 130K msgs sent today, here's tons of reasons why your Imail can't 
deliver, but doesn't log why, to remote servers and is forced to defer the 
msg to the Imail queue:

message deferral detail
-----------------------
   qmgr
         58   mx4.dc2.adelphia.net[64.8.50.67]: Connection refused
         53   mail.zwallet.com[209.61.191.39]: Connection refused
         50   mx3.dc2.adelphia.net[64.8.50.86]: Connection refused
         32   mx1.dc2.adelphia.net[64.8.50.66]: Connection refused
         28   mail2.zwallet.com[209.61.187.42]: Connection refused
         13   Connection refused
         13   Operation timed out
         13   smtp.indiatimes.com[203.199.93.5]: Connection refused
         13   mx1.nb.net[209.161.64.37]: Operation timed out
         10   mail5.localnet.com[207.251.201.40]: Connection refused
          6   mx1.nb.net[209.161.64.37]: Connection refused
          3   smtp.indya.com[203.200.51.200]: Connection refused
          1   mail.geocities.com[66.218.76.52]: Connection refused

smtp
        566   Error: Mailbox locked - blt, try later
        178   Timeout waiting for client input
        118   server refused mail service
        100   smtp.indiatimes.com[203.199.93.5]: Connection refused
         97   Operation timed out
         80   mail.zwallet.com[209.61.191.39]: Connection refused
         78   Connection refused
         71   mail2.zwallet.com[209.61.187.42]: Connection refused
         45   mail5.localnet.com[207.251.201.40]: Connection refused
         45   imap.c4.com[209.116.217.40]: Operation timed out
         44   mx1.nb.net[209.161.64.37]: Operation timed out
         44   Host not found, try again
         41   mail.geocities.com[66.218.76.52]: Connection refused
         38   mx5.dc2.adelphia.net[24.48.57.12]: Connection refused
         38   lost connection with mx02.hotmail.com[65.54.254.145] while sen...
         34   mail.geocities.com[66.218.76.53]: Connection refused
         33   mx4.dc2.adelphia.net[64.8.50.67]: Connection refused
         32   Name service error for clogic.ca: Host not found, try again
         29   lost connection with mx01.hotmail.com[65.54.254.145] while sen...
         28   landmarknet.net[207.242.12.119]: Connection refused
         24   mx1.dc2.adelphia.net[64.8.50.66]: Connection refused
         24   server dropped connection
         23   dellnet.com[206.132.166.27]: Operation timed out
         21   mx6.dc2.adelphia.net[24.48.57.11]: Operation timed out
         20   lost connection with mx06.hotmail.com[65.54.254.129] while sen...
         19   Name service error for street-heat.com: Host not found, try again
         17   4.2.2 <[EMAIL PROTECTED]>... Mailbox [EMAIL PROTECTED] i...
         17   Name service error for chesmatv.com: Host not found, try again
         16   Name service error for kna.to: Host not found, try again
         16   Name service error for zdnetonebox.com: Host not found, try again
         16   24.168.252.64[24.168.252.64]: Operation timed out
         16   Couldn't process control file
         16   Name service error for boral.com.pg: Host not found, try again
         15   kathyland.com[213.130.63.232]: Operation timed out
         15   mail.hkem.com[202.66.151.118]: Operation timed out
         14   relay.cantv.net[200.44.32.56]: Connection refused
         14   mx3.dc2.adelphia.net[64.8.50.86]: Operation timed out
         14   Name service error for mvip.net: Host not found, try again
         13   Name service error for wizardco.com: Host not found, try again
         13   mx6.dc2.adelphia.net[24.48.57.11]: Connection refused
         12   webv.net[212.100.230.160]: Operation timed out
         12   secure.palm.com[165.212.8.251]: Operation timed out
         12   mx3.dc2.adelphia.net[64.8.50.86]: Connection refused
         12   beauty-nymphets.com[67.97.112.82]: Operation timed out
         12   diamond.config.com[216.28.158.12]: Connection refused
         11   Name service error for ohiohill.com: Host not found, try again
         11   oal.com[216.162.163.38]: server dropped connection
         11   Name service error for micron.net: Host not found, try again
         11   lost connection with mx04.hotmail.com[65.54.254.145] while sen...
         11   mx1.dc2.adelphia.net[64.8.50.66]: Operation timed out
         10   painewebber.com[161.15.35.126]: Operation timed out
         10   smtp.indya.com[203.200.51.200]: Connection refused
         10   ucsinet.com[216.63.159.7]: Connection refused
         10   npwt.net[208.234.169.182]: server dropped connection
         10   4.4.5 Insufficient disk space; try again later
         10   lost connection with mx07.hotmail.com[65.54.254.129] while sen...
         10   Name service error for pdcebbs.com: Host not found, try again
         10   4.2.2 Message would exceed quota for <[EMAIL PROTECTED]
         10   lost connection with smtp-gw-4.msn.com[207.46.181.13] while se...
          9   chico.cablelan.net[139.142.84.10]: Connection refused
          9   4.2.2 Message would exceed quota for <[EMAIL PROTECTED]>
          9   4.2.2 <[EMAIL PROTECTED]>... Mailbox [EMAIL PROTECTED] is ...
          9   conversation with mail05.startcorp.com[203.110.142.70] timed o...
          9   4.2.2 <[EMAIL PROTECTED]>... Mailbox full
          9   [EMAIL PROTECTED] Mailbox has exceeded disk quota (99
          9   mail.grm.net[167.142.176.164]: read timeout
          9   Name service error for africomail.com: Host not found, try again
          8   Name service error for excite.co.uk: Host not found, try again
          8   Name service error for libertybay.com: Host not found, try again
          8   Name service error for webb2k.net: Host not found, try again
          8   etownky.etownky.net[66.20.229.12]: Operation timed out
          8   truelovers.com[130.94.74.45]: Operation timed out
          8   Requested action not taken: Insufficient system storage.
          8   mx1.nb.net[209.161.64.37]: Connection refused
          8   Name service error for gatemail.net: Host not found, try again
          8   Name service error for hotail.com: Host not found, try again
          8   maitri.stph.net[196.12.32.25]: Operation timed out
          8   Name service error for pond.net: Host not found, try again
          7   Name service error for iowaisp.net: Host not found, try again
          7   mail06: Server too busy
          7   snubby.enic.cc[206.191.159.103]: Operation timed out
          7   Error: queue file write error
          7   conversation with mx5.dc2.adelphia.net[24.48.57.12] timed out ...
          7   Name service error for probiznews.com: Host not found, try again
          7   paper.tjiwi.co.id[202.148.10.35]: Connection refused
          6   4.2.2 <[EMAIL PROTECTED]>... Mailbox [EMAIL PROTECTED] i...
          6   7of9.roberts.com[63.120.149.4]: Operation timed out
          6   odessa.bham.lib.al.us[198.49.31.13]: read timeout
          6   Name service error for elsa.com: Host not found, try again
          6   Name service error for wbtv.net: Host not found, try again
          6   Connection timed out with opt-in4email.com
          6   Name service error for techcom.net: Host not found, try again
          6   mail.telenet.net[204.97.152.224]: Connection refused
          6   lost connection with mx5.dc2.adelphia.net[24.48.57.12] while s...
          6   mx1.polbox.com[212.244.200.11]: Connection refused
          6   mail10.eth.net[202.9.174.30]: Operation timed out
          6   homw.com[216.148.221.150]: Operation timed out
          6   Name service error for mavix.net: Host not found, try again
          6   Unable to find go2france.com
          6   gbcnet.net[209.158.33.4]: Connection refused
          6   Name service error for egerton.ac.ke: Host not found, try again
          6   mx.stato.com[66.240.160.12]: Connection refused
          5   walnut.config.com[216.28.158.11]: Connection refused
          5   honolulu.cchono.com[12.24.52.3]: Operation timed out
          5   4.7.1 [EMAIL PROTECTED] Mailbox has exceeded disk quota (99
          5   Name service error for viatechintl.com: Host not found, try again
          5   hotmaiil.com[216.102.246.27]: Operation timed out
          5   mail2.chatb.com[192.36.140.73]: Connection refused
          5   atti.com[213.130.63.232]: Operation timed out
          5   mail.spii.net[208.2.167.40]: Operation timed out
          5   b0x1.ods.org[24.70.150.218]: Operation timed out
          5   4.2.2 <[EMAIL PROTECTED]>... Mailbox [EMAIL PROTECTED]
          5   om2.gto.net.om[212.72.23.42]: Connection refused
          5   vpnet.com[216.168.224.70]: Connection refused
          4   mail.packbell.net[209.63.22.27]: Connection refused
          4   RCPT TO:<[EMAIL PROTECTED]> no diskspace
          4   conversation with mail04.startcorp.com[203.110.142.74] timed o...
          4   net-thing.com[209.146.39.6]: No route to host
          4   mx.cybersouth.com[207.53.87.62]: Connection refused
          4   mx6.chinaren.com[61.135.131.219]: Operation timed out
          4   mail.seascape.ns.ca[216.129.30.5]: Operation timed out
          4   mail.mailwatch.com[204.253.83.157]: read timeout
          4   lost connection with smtp.post.sk[62.168.71.134] while sending...
          4   mail.volfirst.net[63.111.226.132]: Connection refused
          4   mail.seemac.com[216.43.41.135]: Connection refused
          4   qq write error or disk full (#4.3.0
          4   net-thing.com[209.146.39.6]: Operation timed out
          4   mx4.dc2.adelphia.net[64.8.50.67]: Operation timed out
          3   aurora.uaf.edu[137.229.18.100]: Operation timed out
          3   conversation with aurora.uaf.edu[137.229.18.100] timed out whi...
          3   conversation with mx3.dc2.adelphia.net[64.8.50.86] timed out w...
          3   No route to host
          3   mx2.chinaren.com[61.135.132.233]: Operation timed out
          3   conversation with mail01.startcorp.com[203.110.142.69] timed o...
          3   4.2.2 Message would exceed quota for <[EMAIL PROTECTED]>
          3   Name service error for uscpa.com: Host not found, try again
          3   <[EMAIL PROTECTED]>... Sender domain m...
          2   science.uz.ac.zw[196.4.80.3]: Operation timed out
          2   mailin.transnet.co.za[196.33.180.166]: read timeout
          2   Name service error for netmaill.com: Host not found, try again
          2   tr6.es.com[130.187.60.71]: Operation timed out
          2   4.1.8 Domain of sender address [EMAIL PROTECTED]
          2   mail1.aaahawk.com[64.63.192.5]: Operation timed out
          2   sngo.za.sappi.com[62.200.131.193]: Operation timed out
          2   Name service error for spii.net: Host not found, try again
          2   mail.gotmail.com[216.187.101.70]: Connection refused
          2   mail04.unilever.com[194.60.106.6]: Operation timed out
          2   sngo.za.sappi.com[62.200.131.193]: Connection refused
          2   mailin.weppy.com[203.246.198.203]: No route to host
          2   Insufficient system storage
          2   par1.net[208.189.18.244]: Connection refused
          2   lost connection with mail04.startcorp.com[203.110.142.74] whil...
          2   20-20freight.com[64.27.110.159]: Connection refused
          2   zeus.candw.lc[206.48.60.10]: Connection refused
          2   lost connection with meb-mail.meb.co.za[196.33.49.82] while se...
          2   RCPT TO:<[EMAIL PROTECTED]> no diskspace
          2   mail.compfxnet.com[207.203.254.3]: Operation timed out
          2   mail-ext.txucom.net[207.70.175.10]: read timeout
          1   mail.tdn.com[216.65.152.3]: Connection refused
          1   mail.stis.net[64.242.140.13]: Connection refused
          1   mail.stratics.com[216.105.168.107]: Connection refused
          1   smtp.indiatimes.com[203.199.93.5]: Operation timed out
          1   Name service error for foxsystems1.com: Host not found, try again
          1   peach.ease.lsoft.com[209.119.1.30]: Connection refused
          1   mail.grm.net[167.142.176.164]: Operation timed out
          1   Can't connect to swva.net - psmtp
          1   4.3.0 Temporary system failure. Please try again later.
          1   xns1.za.eds.com[196.13.63.131]: Connection refused
          1   conversation with gateway6.att.net[204.127.134.23] timed out w...
          1   Name service error for b.mx.sybertech.net: Host not found
          1   messagez.com[64.38.226.16]: Connection refused
          1   lost connection with smtp.indiatimes.com[203.199.93.5] while s...
          1   lost connection with nbi.ispkenya.com[212.49.87.2] while sendi...
          1   mail.cei.net[204.117.117.29]: Connection refused
          1   mail.hoymail.com[216.254.61.138]: Operation timed out
          1   conversation with rssc.co.sz[216.72.196.34] timed out while se...
          1   mail.door.net[208.234.228.206]: Connection refused
          1   conversation with gateway4.worldnet.att.net[204.127.134.23] ti...
          1   local error; try message later (BE
          1   catskill.net[205.232.250.4]: read timeout
          1   216.234.216.40[216.234.216.40]: Connection refused
          1   qq trouble creating files in queue (#4.3.0
          1   Can't connect to pennswoods.net - psmtp
          1   smtp-gw-4.msn.com[207.46.181.13]: read timeout
          1   conversation with mars.net.sy[66.198.41.7] timed out while sen...
          1   mail.msis.net[208.232.112.3]: Connection refused
          1   conversation with mx1.prserv.net[32.97.166.40] timed out while...
          1   conversation with mail.firstmco.com[65.164.243.51] timed out w...
          1   conversation with mx2.san.ci.la.ca.us[66.28.148.36] timed out ...
          1   om7.omantel.net.om[212.72.23.43]: Operation timed out
          1   Can't connect to hpnc.com - psmtp
          1   conversation with smtp1.repsolypf.com[195.53.125.137] timed ou...
          1   mail.tdn.com[216.65.152.3]: read timeout
          1   mx1.hongkong.com[202.84.15.133]: Operation timed out
          1   mx1.hongkong.com[202.84.15.133]: Operation timed out
          1   conversation with mx2.prserv.net[32.97.166.40] timed out while...
          1   RCPT TO:<[EMAIL PROTECTED]> no diskspace
          1   Can't connect to graceba.net - psmtp
          1   lost connection with mail.loras.edu[192.152.29.35] while sendi...
          1   4.3.0 SMTP-MAIL: died on signal 11
          1   mail.grm.net[167.142.176.164]: Connection refused
          1   lost connection with mail.network60.com[63.240.11.111] while s...
          1   Name service error for pgen.net: Host not found, try again
          1   tom.ffa.com.lb[193.227.163.34]: Operation timed out
          1   hotmaiil.com[216.102.246.27]: Connection refused
          1   4.1.8 <[EMAIL PROTECTED]>... Domain of se...
          1   mx1.polbox.com[212.244.200.11]: read timeout
          1   mailscan.dpzone.com[66.247.44.26]: Operation timed out
          1   mx1.compuserve.com[149.174.40.4]: Connection refused
          1   lb.sexfiles.com[63.196.52.101]: Operation timed out
          1   Name service error for dowco.com: Host not found, try again
          1   correo.medios.net[212.34.129.32]: Connection refused
          1   conversation with mx1.mts.net[205.200.16.59] timed out while s...
          1   dilbert.valunet.com[206.26.6.2]: Operation timed out
          1   20-20freight.com[64.27.110.159]: Operation timed out
          1   mail.monmouth.com[209.191.58.1]: Connection refused
          1   mx8.chinaren.com[61.135.131.3]: Operation timed out
          1   lost connection with janus.delmonte.co.za[195.183.41.150] whil...
          1   conversation with mail.lek.net[66.218.128.35] timed out while ...
          1   server2.dti.gov.ph[203.172.27.4]: Operation timed out
          1   Name service error for dti.gov.ph: Host not found, try again
          1   conversation with mail.mintek.co.za[196.6.222.19] timed out wh...
          1   4.3.0 The virus scanning server was not available to scan ...
          1   mail.appsoft.co.za[196.22.184.42]: Operation timed out
          1   dti.dti.gov.ph[203.172.27.68]: Operation timed out




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