When you try to receive mail that is over 10mb into an Exchange 2010 mailbox, the sender may receive this bounce back error.

Your Exchange 2010 server may need a few settings changed if you want to receive mail of this size.

Due to the way Exchange routes emails we found the following settings helpful if you are using a facility such as popcon to download incoming mail.

1. Organization Configuration ->Hub Tansport.
   Go to Global Settings -> Transport Settings
   Set the Maximum send and receive size to KB values that suit eg. 20480 for 20mb or 51200 for 50mb
   
2. Go to Server Configuration ->Hub Transport
   Go through the receive connectors one-by-one and right-click -> Properties
   
3. Set the Maximum message size to a size that suits such as 20480 for 20mb and click OK. DO this for all the receive connectors unless you have a special one that you use for a certain purpose and needs to remain lower.
   

Now the larger messages from outside your organisation should get to their destination mailboxes in your Exchange 2010 Server.

Authored by Ian

Ian Johnson is a Director of OJ Networks. He has been working in IT since 1995. Mentored by the best, Ian started as Technical Support Officer for an innovative dialup ISP in Brisbane “Hub Communications”. He progressed to become a Web Design and Programmer in ASP, ASP.NET and PHP during his time at “The Lab Development Group” with David Vandenberg amonst others. Ian has been working as a Consultant on the Sunshine Coast since 2001 and became a Microsoft Certified Information Technology Professional (MCITP) Server Administrator in 2010 after which he formed OJ Networks. He has assisted numerous small businesses to reach their potential through IT Infrastructure Planning and Implementation and Web design, Development and Web Marketing. You can connect with Ian on Linked In.