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non delivery (NDR) not getting back to sender

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    Posted: 14 December 2010 at 10:24pm
njtech,

By default SpamFilter will include the entire message in an NDR. If your Exchange server rejects an email from SpamFilter, then SpamFilter will generate an NDR for the sender, and will forward that NDR for delivery to your Exchange server. If the original rejection by Exchange was due to an excessive message size, the NDR will also be exceeding the max message size, as the NDR contains the original email within it.

To solve this issue, we actually recently posted a new SpamFilter build (4.2.4.840) that includes support for the following option in the SpamFilter.ini file:

// New to VersionNumber = '4.2.4.840';
{TODO -cNew Added support for a new parameter in the SpamFilter.ini file to control if the NDR will contain the entire original email or only its headers: IncludeOriginalMessageOnNDR=1}

If you thus set that value to "0" that should take care of the problem. You can manually add that parameter if it doesn't exist yet.


Edited by LogSat - 14 December 2010 at 10:25pm
Roberto Franceschetti

LogSat Software

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Post Options Post Options   Thanks (0) Thanks(0)   Quote njtech Quote  Post ReplyReply Direct Link To This Post Posted: 13 December 2010 at 8:35pm
I have spamfilter isp setup to forward to a exchange 2010 server. If a recipient sends to a invalid exchange address the recipient will get  a NDR (non delivery report) no problem works as desired.

However, if the email attachment size exceeds what is allowed on the
exchange server the ndr is never gets back to the recipient. At first
glance it appears its a exchange problem however if
I remove spamfilter the NDR works. any suggestions?

in the spam filter logs I see this:( I masked the actual email addresses and server name)

12/13/10 15:54:51:083 -- (24480) Error-email from sender@address.com to recipient --  was forwarded to myexchangeserver:25
12/13/10 15:54:51:083 -- (24480) There was an error sending the NDR to: sender@email The remote server said:validuser@gmail.com: 550 5.7.1 Unable to relay -- 
12/13/10 15:54:51:130 -- (24480) server error - myexchangeserver:25 said: 5.3.4 Message size exceeds fixed maximum message size -- 

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