Stop prompts "This item contains unsafe attachments"

[Usarian]

Our business has begun using a feature of our shipping software which emails
customers a copy of their bill-of-lading automatically.

Doing this has always caused a pop-up for an external application using
outlook in general, and we dealt with that by using a small program that
autimaticaly clicks YES.

Recently, however, some (not all) newer email addresses we are emailing to
cause a second pop-up:
"This item contains attachments that are potentially unsafe. Recipients
using Microsoft Outlook may not be able to open these attachments. Do you
want to send anyway?"

Any ideas?

 

[Sue Mosher [MVP-Outlook]]

http://www.slipstick.com/outlook/esecup/getexe.htm

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003

and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers