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PRB: Exchange Server 5.5 Rejects POP3 Messages in Base64

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This article was previously published under Q270614

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Symptoms

If you submit a message that has a Base64 body part to Exchange versions 5.5 and earlier by using Post Office Protocol 3 (POP3), and the body part contains extraneous characters after the termination sequence, you may receive the following error message even if the extraneous characters are otherwise valid:
The Microsoft Exchange Server received an Internet message that could not be processed. To view the original message content, open the attached message. <<message.txt>>

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Cause

Exchange only accepts Base64 encodings that are multiples of 4 in size. The extraneous characters cause the encoding size to not be a multiple of 4, so Exchange rejects the encoding.

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Resolution

Do not append extra characters to the end of a Base64 sequence that is submitted to Exchange.

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Status

This behavior is by design.

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Keywords: KB270614, kbprb

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Article Info
Article ID : 270614
Revision : 3
Created on : 3/12/2004
Published on : 3/12/2004
Exists online : False
Views : 249