[Exim] Duplicate Mails

Hello All,

Sorry Again,

I have a mail account a@??? which is forwarded to another mail account
b@??? (account on another server) the forwarding work fine. but the mails
on a@??? resides on my server after forwarding and consumes lot of space
in my inbox. and another problem is the mail is sent twice on b@???.

I don't want the mails to be on a@??? after forwarding and normally mails
r receiced only once Right!!!! :(

Help Needed!!!

Regards,

Vishal