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Email size restrictions RRS feed

  • Question

  • Hi all,

    I have a simple question about size limitation of receive connectors in Exchange2007.

    I set size limits as 10240KB in property of receive connectors, however we could not receive 8MB mails.

    Is anyone who can explain the reason of why we can receive 7MB mails, but not 8MB mails?

    I would like to receive 10MB mails, but not 11MB mails.

    Wednesday, February 20, 2013 7:58 AM

Answers

  • If you want to send/receive attachments that are on the 10 MB range, then you are going to have to increase your limits to account for what is known as "MIME bloat".  This bloat is due to the MIME encoding of the messages.

    See here for calculations - http://en.wikipedia.org/wiki/Base64#MIME and http://support.microsoft.com/kb/323489?wa=wsignin1.0

    So according to that math, you need to set your limit to something around 13.3-13.7 MB.  Hope that helps.


    JAUCG - Please remeber to mark replies as helpful if they were or as answered if I provided a solution.

    • Proposed as answer by Martina_Miskovic Wednesday, February 20, 2013 9:18 PM
    • Marked as answer by TechCCC Thursday, February 21, 2013 7:53 AM
    Wednesday, February 20, 2013 2:52 PM
  • Dear JAUCG,

    Thank you very much for your great support.

    I will set the size restriction as around 14 MB.

    And Frank,

    Thank you for your reply.

    I will update it as soon as I can.

    • Marked as answer by TechCCC Tuesday, February 26, 2013 1:46 AM
    Thursday, February 21, 2013 7:58 AM

All replies

  • If you want to send/receive attachments that are on the 10 MB range, then you are going to have to increase your limits to account for what is known as "MIME bloat".  This bloat is due to the MIME encoding of the messages.

    See here for calculations - http://en.wikipedia.org/wiki/Base64#MIME and http://support.microsoft.com/kb/323489?wa=wsignin1.0

    So according to that math, you need to set your limit to something around 13.3-13.7 MB.  Hope that helps.


    JAUCG - Please remeber to mark replies as helpful if they were or as answered if I provided a solution.

    • Proposed as answer by Martina_Miskovic Wednesday, February 20, 2013 9:18 PM
    • Marked as answer by TechCCC Thursday, February 21, 2013 7:53 AM
    Wednesday, February 20, 2013 2:52 PM
  • Hi Shintaro,

    Any updates?


    Frank Wang
    TechNet Community Support

    Thursday, February 21, 2013 7:31 AM
  • Dear JAUCG,

    Thank you very much for your great support.

    I will set the size restriction as around 14 MB.

    And Frank,

    Thank you for your reply.

    I will update it as soon as I can.

    • Marked as answer by TechCCC Tuesday, February 26, 2013 1:46 AM
    Thursday, February 21, 2013 7:58 AM
  • I changed the limit to 15MB, it works well now.

    Thank you very much, JAUCG and Frank!

    Tuesday, February 26, 2013 1:49 AM