I have unsuccessfully tried to increase per user incoming mail size settings by editing their user account settings on our Exchange server, but large incoming mail from external domains is still blocked using the default global settings.
After reading here: http://support.microsoft.com/default.aspx?scid=kb;en-us;322679
I see that
All Internet e-mail messages use the global setting for limits on sending and on receiving. The message categorizer evaluates the sender's sending limit and the recipient's receiving limit. In example 2 earlier, a user with a user mailbox limit of 3 MB could receive messages from another user with a 3-MB sending limit. Because Internet users use the global setting, they can send only a 2-MB message.
Which to me is madness! Surely if I want to allow a user to receive mail up to a certain size then I should be able to set it as such?
Is there a specific way of getting round this? Would setting the global defaults high and setting a lower, say 10MB, limit on the SMTP connector do the trick?