Overhead in converting to SMTP/MIME format while in transit is my guess

Blackberry

From: Benjamin Zachary [mailto:li...@levelfive.us]
Sent: Friday, February 24, 2012 02:31 PM
To: MS-Exchange Admin Issues <exchangelist@lyris.sunbelt-software.com>
Subject: Exchange Attachment Size Issue

Hi all, just an odd question. I have a client who sends out this 8.5MB pdf 
contract , they have been using it for years, recently the last couple of 
months its getting rejected as being larger than 10mb by many organizations.

I did a quick test, and I see in the logs that when the email is sent the 
transfer is over 11 million bytes . Doing some quick math 8.5MB * 1024 * 1024 = 
8912 , but Im seeing 11.4 , 11.3 on the smtp transfer.

As a test I sent it to gmail, and sent it back and it was basically the same 
11.4 million bytes. I could shrink the PDF size down as a possible option (they 
make about 30 of these per day) but was trying to figure out what would make an 
8.5MB email (no text , tried plain , rich, html) would come across as 11.4 
million (or 11 megs). My initial thought was that as people move to the cloud 
exchange and hosted apps there probably is 10 meg limits , but some of these 
are clients they do business with for years and is highly unlikely to impose 
these kind of restrictions (although I am checking).

Bottom line the client believes we did something in January to their Exchange 
2010 SP1 server that is causing this …

Any ideas appreciated …




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