Email forwarding

Hi,

I am using procmail to do email forwarding.
We have lots of addresses under one domain name.
I am wondering whether procmail RC can read following file for 
email forwarding?

user1(_at_)domainA       person1(_at_)domain1
user2(_at_)domainA       person2(_at_)domain2
user3(_at_)domainA       person3(_at_)domain3
user4(_at_)domainA       person4(_at_)domain4
user5(_at_)domainA       person5(_at_)domain5

Or can this be done by sendmail?

Is there a sendmail mailing list around?

Many thanks in advance.

JZ