Adjusting 10MB Postfix limit when sending or receiving email messages

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Solution ID Last Updated
1060651 Date : 2013/05/27 Time:5:53 AM , (PST)


Product/Version Platform
InterScan Messaging Security Virtual Appliance - 8.0, 8.2, 8.5;
N/A - N/A

Problem Description

You are still unable to send or receive emails higher than 10MB even if the limitations have been adjusted or removed on the management console of InterScan Messaging Security Virtual Appliance (IMSVA).
If you check the mail log, it shows the following:
Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: resolve_clnt: `' -> `egodinho@gmail.com' -> transp=`smtp' host=`gmail.com' rcpt=`egodinho@gmail.com' flags= class="default" Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: ctable_locate: install entry key egodinho@gmail.com Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: extract_addr: in: , result: egodinho@gmail.com Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: NOQUEUE: reject: MAIL from unknown[216.104.13.15]: 552 5.3.4 Message size exceeds fixed limit; proto=ESMTP helo= Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: > unknown[216.104.13.15]: 552 5.3.4 Message size exceeds fixed limit Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: < unknown[216.104.13.15]: RSET Jan 17 17:25:50 imsva8 postfix/smtpd[7064]: > unknown[216.104.13.15]: 250 2.0.0 Ok

Solution

IMSVA uses Postfix as its Mail Transfer Agent (MTA). It receives messages either directly from the sending MTA or from the IP Profiler (FoxProxy), and it sends and receives messages from the Scanner Service (Scanning Daemon).
The message size limit configuration on the Message Rule and Scanning Exceptions of the management console affects the parameter maxMsgSizeInMB in tb_global_setting. This can be checked in imss.ini.db.
The Postfix also has its own a message size limit.
To adjust the message size limit on Postfix:
  1. On the IMSVA console, go to Administration > SMTP Routing > Message Rule.
  2. Under Maximum Message size field, increase the value.
  3. Click Save.


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