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Order of precedence and placement of message size limits with Exchange 2016 RRS feed

  • Question

  • Hi

    We are trying to understand the Order of precedence and placement of message size limits with Exchange 2016. We found an article https://technet.microsoft.com/en-us/library/bb124345(v=exchg.150).aspx, with receive connectors there are Default FE <server> connector, Default <server> connector then Global Transport configuration and limit with Mailbox. 

    For external mails, the mails will be received by Default FE<server> connector, then the limits with Global Transport configuration will be applied, then the Default <server> connector and finally the limit with Mailbox will be applied. 

    For Internal mails, the mails will be received by Default <server> connector, then the limits with Global Transport configuration will be applied and finally the limit with Mailbox will be applied. 

    Please comment whether our understanding is correct or not

    Thanks in advance

     


    LMS

    Monday, October 8, 2018 6:30 AM

All replies

  • Hi,

    Not really. The more restrictive limits always take precedence.

    For external mails, if we set the global transport config limit to be 10MB, Exchange will only receive emails that is less than or equal to 10MB, regardless of the receive connector limit and mailbox limit. If we set the global transport config limit to be 30MB, and set the receive connector limit to be 10MB, Exchange will only receive emails that is less than or equal to 10MB on that particular receive connector.

    For internal mails, the user level limits take precedence over other message size restrictions. Even if we set the mailbox limit to be 50MB and set the global transport config limit to be 10MB, we could still send and receive 50MB emails internally. 

    Regards,

    Manu Meng


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    Tuesday, October 9, 2018 3:32 AM
  • Thank You Manu.

    But in our case we configured Global as well Default FE <server> receive connector with a limit of 28 MB and Default <server> receive connector with 20 MB. But still internally & externally we are receiving 25 MB mails. How this works? 


    LMS

    Wednesday, October 10, 2018 7:58 AM
  • Thank You Manu.

    But in our case we configured Global as well Default FE <server> receive connector with a limit of 28 MB and Default <server> receive connector with 20 MB. But still internally & externally we are receiving 25 MB mails. How this works? 


    LMS

    If the limit of the Default <server> receive connector on all Mailbox servers are the same? 

    Regards,

    Manu Meng


    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Friday, October 12, 2018 7:00 PM
  • Hello

    In your case this is the "Default Frontend YOURSERVER" MaxMessageSize value that is important because you receive mails coming fron your gateways via port 25.

    You said you set that value to 28 MB.

    So this is normal to receive a 25 MB mail.
    Please set it to 15 or 20 MB.

    Florent

    Wednesday, October 17, 2018 3:42 PM