I have a supplier (negs) which I email artwork either as a pdf of SIT file - 
usually once a day. About 50% of the attachments I send become corrupt at 
their end. The fact is that it's only my files that become corrupt (ie. they 
receive about 15 other attachments a day without a hitch.) The problem seems 
to have started since I started using my G4 (400, 428mb, OS9.1, OE5) - I was 
using an 8600/250 until recently. However, when I "cc" the attachment to 
myself, it comes back OK every time!

Usualy, when I send the attachment a second time, it is OK.

They receive their email on a Mac using netscape and we have both checked 
with our ISPs who can't see any problems.

I would appreciate any thoughts or possible remedies. 

Many thanks,

Travis