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Incoming email corrupt, from Yahoo - disable Chunking and BinaryMIME

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  • Incoming email corrupt, from Yahoo - disable Chunking and BinaryMIME

    My organisation is currently experiencing random incoming emails from Yahoo being corrupt.

    Our servers are Microsoft Exchange 2003 in a frontend/backend configuration.

    Extensive testing shows that test emails may be sent with a header longer than 1000 characters which is not compliant with RFC 2822. An email with exactly the same content and attachment may be once sent with a correct header length and arrive correctly and then sent with too long a header and arrive corrupt.

    http://support.microsoft.com/kb/821733/en-us appears to detail this issue and suggests the work around of disabling the ESMTP verbs, Chunking and BinaryMIME.

    I have tested this in our test environment and it appears to fix the issue.

    My question is, does anyone know what performance issues this may cause if I implement it in the live environment?

    I have logged a support call with Yahoo and am awaiting their feedback.
    Last edited by Robe; 10th December 2009, 04:04.
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