Unable to send email even though message size limits are set

With exchange 2007, you may have come across a situation when you have set message size restrictions correctly at all the four places as per Microsoft:

1. Global/Organizational Limit

2. Connector Limit

2.1 Send Connector

2.2 Receive Connector

2.3 Active Directory SiteLink Limit

2.4 Routing Group Connector Limit

3. Server Limits

4. User Level Limits

There may be times still that if you have set a 10 MB limit everywhere, users are not able to send/receive emails with attachments of 7 MB even. The problem happens because content conversion happens when Exchange converts an internet (MIME) message into Exchange (MAPI) format, and vice versa.

This conversion is done by Exchange while sending/receiving emails to/from Internet. Content conversion generally increases the message size - roughly by 30%.

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Tags: Exchange Server
Published Date: 20100817