When sending and email threw a .NET Web-service we use the System.Net.Mail (2.0) Objects and Namespace to send an SMTP email threw the gateway. The issue is that long attachment names (46 chars+) get a spaced removed in the attachment title when viewing in the recipients mailbox.

Example sending attachment "hello boo that is a good file.ext" would show up in the recipients email like this "hello boo thatis a good file.ext"

Funny thing is that it seams to arbitrary removing the space from the filename around the middle.

I double check the Mail object in .NET right before the send command and the title is correct. I looks like the SMTP gateway is causing the issue...

Thanks for any help.