Hi,

As this is occurring at some of your customer sites only, it sounds like their email client is stripping out the attachment for some reason. Perhaps it thinks it's spam or something. When you forward the email, their email client is treating the attachment differently. They'll need to look at their email settings.

What happens if you send to this customer individually from within Receiables' email queue (i.e. don't use Send All). Do they receive everything then? Also, is your Receivables email setup for Direct or MAPI?

As you have customers that are receiving the attachments, Receivables is definitely sending all of the information.