.. cc_skavenger is mistaken tho it takes a bit of messing around to get what you want.
Say we have two domains dog & cat:
a) setup user accounts salesdog & salescat
b) setup pseudonymns of sales@dog.com mapped to salesdogs account, etc
c) collect salesdog, salescat email
Done this myself and it works fine tho teious if there are lots of domains.
HTH