I rarely send attachments but when I do I keep getting bumped with this message:

Message has not been sent. Server reply r mail, and with "." on line by itself

Now, all I do is pick the recipient from the address book and the attachment from the folder. Nothing is manually inputted so the Bat must be putting smething erroneous in.  I have checked with my ISP and they say gthere's nothing wrong with their smtp server and attachments are not banned in any way.

Any help gratefully received.