More than 2 MB attachment is not coming from out side


  • I am using exchange server 2010. I am not getting more than 2 MB attachment from out side. Internally it is working fine but externally it is not working. I have allowed 10 MB mail size on receive connector. I think 10 MB is default size.
    I have spoken with logix team for the same, they are saying message is reaching to exchange server. General mail flow is working fine but if you attach 5 MB attachment. then it is not coming in side my organization,

    C:\Windows\system32>Get-TransportConfig | FT MaxSendSize, MaxReceiveSize

    MaxSendSize                             MaxReceiveSize
    -----------                             --------------
    11.72 MB (12,288,000 bytes)             14.65 MB (15,360,000 bytes)

    [PS] C:\Windows\system32>

    [PS] C:\Windows\system32>Get-ReceiveConnector | FT Name, MaxMessageSize

    Name                                    MaxMessageSize
    ----                                    --------------
    Default BIOMAIL                         10 MB (10,485,760 bytes)
    Client BIOMAIL                          10 MB (10,485,760 bytes)

    [PS] C:\Windows\system32>

    [PS] C:\Windows\system32>Get-SendConnector | FT Name, MaxMessageSize

    Name                                    MaxMessageSize
    ----                                    --------------
    Internet Send Connector                 10 MB (10,485,760 bytes)
    Logix Relay Connector                   11.72 MB (12,288,000 bytes)

    [PS] C:\Windows\system32>

    [PS] C:\Windows\system32>Get-Mailbox administrator | FT Name, MaxSendSize, MaxRe

    Name                       MaxSendSize                MaxReceiveSize
    ----                       -----------                --------------
    Administrator              unlimited                  unlimited

    [PS] C:\Windows\system32>


    Friday, November 10, 2017 4:45 AM

All replies

  • Hi,

    Have you check with your ISP or the mail gateway and see if there is a limit restriction?

    Friday, November 10, 2017 5:01 AM
  • Yes, I have checked, no issue at gateway. I have asked gateway provider

    Below are the log details: 


     Date 2017-11-08 12:51:11 



     Subject Test mail with attachment at 12.21PM 

     Message ID   


     Delivery Type Bounce 

     DSN Status 5.3.4 (message too big for system) 

     DSN Dialog smtp;552 5.3.4 Message size exceeds fixed maximum message size 

     Delivery IP 

     Bounce Category other 


    • Edited by azahri miya Friday, November 10, 2017 5:53 AM
    Friday, November 10, 2017 5:52 AM
  • Hi

    Test an email from the sender domain to your domain and read the headers. find out the exact path email takes to travel.

    I am assuming there has to be a receive connector that is receiving emails from your email gateway. Check the limits on that connector

    Thanks & Regards Ramandeep Singh

    Saturday, November 11, 2017 7:37 AM
  • I'm guessing the IP is your Exchange Server?

    How about remove the restriction on TransportConfig and test it out. If that doesn't work then try again with receive connector.

    Saturday, November 11, 2017 11:21 AM
  • Hi miya,

    By default in Exchange, the size of the message can change because of content conversion, encoding, and agent processing, the message size generally increases by about 30%. As a result, a message of 9 MB may fail to deliver to a server with size limit 10 MB.

    So, I agree with Michael. You can increase the limit size one by one(Transprot Config/Receiver Connector/User Mailbox) as a test and check if any helps.

    Details see: Understanding Message Size Limits

    Best Regards,

    Best Regards,

    Niko Cheng

    Please remember to mark the replies as answers if they helped.
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    Monday, November 13, 2017 7:45 AM
  • Hi miya,

    I'm just writing to check how's everything going? If you have any questions or needed further help on this issue, please feel free to post back. If the issue has been resolved, please mark the helpful replies as answers, this will make answer searching in the forum easier and be beneficial to other community members as well.


    Thanks for your understanding.

    Best Regards,

    Niko Cheng

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

    Tuesday, November 21, 2017 2:14 AM