Check Tools | Options | Sending mail

Do you have a check on:
Send attachments as separate messages?


Also check:
Don't add 'attachment information' sections to multipart messages

Does this correct the issue? 

When I send emails, the person gets multiple emails if I have an attachment.  For instance, I sent an email with two attachments and a read receipt checked.  I got back three read receipts.   If I have no attachments, I only get back one and the user only gets one email.  I am sure it is because of how I have things set up under options, but I am not sure what I need to uncheck/check.

Thanks

Donna