D:
I think that if you try to change the execution time the only difference you will notice is a longer wait to receive the same message.
As far as I can say , it could be that the message attachment sent to you have a fault on its mime type code and the script "mimetypes.lib" just stops responding, cause of this fault.
What kind of atachment is?
Have you tryed same attachment to a different mail?
can you download this mail directly from e-smith server to another kind of client (not a webmail)?
maybe the size of the attachment is limited in any way, inside imp
Alejandro