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Incoming Mail with attachment Delivery Delays - Exchange 2013

Hi Guys,
We are having a incoming mail delivery delays.
Environment (YYYYY.org.au):
Exchange 2013 CU3 with separate CAS and MBX roles
Windows 2012
Puremessage spam filtering on MBX server role
Allowed maximum attachment size to send/receive  - 35 MB

Scenario:

1.      Email works internally
2.      Receiving and sending emails with out attachments is instantaneous to and from external parties.
3.      Receiving emails with attachments from external senders  (Ex: gmail) over 3 MB get delayed.  Sometimes by 10-20 hours
4.      Sending emails from the organization to external senders (Ex: gmail) with attachments over 3 MB is instantaneous.

So the problem we are facing is receiving emails with attachments from external senders.  “Some” of these get delivered after long delays but many go missing.

Following is an email header analysis of a delayed message.

Hop      Delay      from      by      with      time (UTC)
1      *      000s-ex-mbx-qs3.AAA.edu.au      000s-ex-hub-np2.AAA.edu.au      mapi      3/6/2014 12:24:12 AM

2      *      000S-EX-HUB-NP2.AAA.edu.au 172.22.174.21      000s-ex-tmg-np2.AAA.edu.au 172.22.174.5      Microsoft SMTP Server (TLS)      3/6/2014 12:23:58 AM

3      57 seconds      000s-ex-tmg-np2.AAA.edu.au 128.250.6.61      CH1EHSMHS001.bigfish.com 10.43.70.1      Microsoft SMTP Server (TLS)      3/6/2014 12:24:55 AM

4      41 seconds      CH1EHSMHS001.bigfish.com 10.43.68.231      mail13-ch1.bigfish.com      ESMTP      3/6/2014 12:25:36 AM

5      3 seconds      mail13-ch1 127.0.0.1      mail13-ch1             3/6/2014 12:25:39 AM

6      3 seconds      mail13-ch1 127.0.0.1      mail13-ch1-R.bigfish.com      ESMTP      3/6/2014 12:25:42 AM

7      0 seconds      mail13-ch1-R.bigfish.com 10.43.68.246      CH1EHSOBE005.bigfish.com 10.43.70.55      Microsoft SMTP Server      3/6/2014 12:25:42 AM

8      20 hour      ch1outboundpool.messaging.microsoft.com 216.32.181.182      CAS01.YYYYY.org.au 10.0.100.103      Microsoft SMTP Server (TLS)      3/6/2014 7:57:17 PM

9      2 minutes      CAS01.YYYYY.org.au 10.0.100.211      MBX01.YYYYY.org.au 10.0.100.125      Microsoft SMTP Server (TLS)      3/6/2014 7:59:40 PM

10      *      MBX01.YYYYY.org.au 10.0.100.125


If you notice , Hop number 8 took 20 hours to complete.


Test results form MX toolbox


Test                                      Result      
SMTP Transaction Time            5.881 seconds       
SMTP Reverse Banner Check      OK – YYY.YYY.YYY.YYY resolves to mail.YYYYY.org.au
SMTP Reverse DNS Mismatch      OK - Reverse DNS matches SMTP Banner      
SMTP TLS                                OK - Supports TLS.      
SMTP Connection Time            1.092 seconds - Good on Connection time      
SMTP Open Relay                  OK - Not an open relay.


Does anyone has any idea about the possible cause of this receive delay.
Any suggestion would be greatly appreciated.
0
o-team
Asked:
o-team
  • 2
1 Solution
 
Simon Butler (Sembee)ConsultantCommented:
"Puremessage spam filtering on MBX server role"

Primary target for anything like this is always third party filtering services.
Remove it, reboot the server, test again. Disabling the product is NOT enough, you have to remove it to confirm it isn't the cause.

Simon.
0
 
o-teamAuthor Commented:
Thank you Simon,
But Puremessage was not the one that caused it.
We found out that incoming SMTP  traffic "Inspection" on Cisco zone based firewall was causing this time out.

Kind Regards
Tiraj
0
 
o-teamAuthor Commented:
Please state a reason for selecting your own comment as the solution.

Because no one else provide the solution.
0

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