how can I change the address xxx(_at_)domain1 to xxx(_at_)domain2

If any one can help I will appreciate, her is the situation:

I use sendmail as MTA and procmail as my LDA, and every thing is setup
correctly and it is up and running, but I would like all messages that come
to xxx(_at_)domain1 to be forwarded to xxx(_at_)domain2 where xxx is the name 
of the
user and it must not change.

Thanks


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