[vchkpw] pop username format

[[EMAIL PROTECTED]]

For backwards compatibility with my current qmail server I will
need to allow users with a 'username.domain.com' format in
addition to the standard '[EMAIL PROTECTED]' format for
POP3 authenticating.

Can someone point me in the right direction to tweak vpopmail to
allow this format.

Thanks,

Joe Kletch
CedarNet LLC