>I've got a friend whose return address is basically
>and we cannot use this as a return address. He can subscribe to a list
>using the command
What does the bounce look like? Is it generated by your mailer or by another
system? That address is in a perfectly valid format. The only question is
whether 'pbs.pbs.dfo.ca' is a legal host (you mentioned later in your message
a hostname without the extra 'pbs' at the beginning).
If 'pbs.pbs.dfo.ca' is a legal host, then your mail config needs to be fixed.
If it's just supposed to be 'pbs.dfo.ca' then your friend's system needs to be