If you want to receive large email attachments (up to 50 Mb) using Exchange, there are several places that need to be checked to make sure large attachments are allowed.
The first place is on the Exchange Server. Within the Exchange server, there are actually a few different places this will need to be set:
- The first one is a global setting, in the Transport Settings (Organization Configuration/Hub Transport/Global Settings tab/Transport Settings properties/General tab).
- The next place you'll need to look is in each receive connector (Server Configuration/Hub Transport/Tranport Server/Receive Connectors/Connector Properties/General tab). Each connector has its own size limit.
- The last place you'll need to check in Exchange is under the recipient's mailbox (Mail Flow Settings tab).
You may also need to make changes in other products (i.e. email filtering) as well.
- If you have Barracuda filtering the default limit may already be set to 100 Mb.
- If your customer has a ZixVPM/ZixGateway, the default limit may be 25 Mb, so it will need to be increased if you need to receive emails larger than that.
- Finally, check your Firewall and/or Border router for any smtp inspection statements or smtp fixup. If any of these exist it may prevent large emails (i.e. larger than 20 Mb) from getting through.