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Why does an email's size increase when sent externally?

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QUESTION POSED ON: 30 August 2007
What causes the 30% increase in message size when an email with an attachment is sent by a Microsoft Outlook MAPI client (from an Exchange 2003 server) to an external Internet address? Are there any guidelines to estimate the size increase various document types will experience, (i.e., .pdf, .doc, .xls, .ppt, etc.)?


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I'm pretty sure that MIME encoding accounts for the message size difference you are seeing.

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Related information from SearchExchange.com:

  • Tip: Outbound message size changes due to format conversions
  • Tip: How to set size limits for all local email messages
  • Reference Center: Exchange and Outlook mailbox management

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