"Recipient Not Authorised" error message

[ScotWeave]

I'm using The Bat! Version 1.60q under Windows 2000 5.0 Build 2195   When I attempt to send an e-mail message the message is not sent and I get the following error -   "Server Reply - Recipient Not Authorised (recipient rejected due to no authorised destination groups)"   Can anyone please tell me what is going wrong  or point me in the right direction to find a solution.   I can send e-mail okay directly to my own e-mail address and I can send e-mail using Outlook Express so my ISP is happy that there is not a problem at their end. This suggests that there's something going wrong in TheBat!   Please help - I am having to use Outlook Express to send this message and this is most distressing !   Thank You   Alan Watters