!mail-mta/courier
net-mail/mailbase
dev-libs/libpcre

gdbm?
      ( >=sys-libs/gdbm-1.8.0 )

mysql?
      ( net-libs/courier-authlib )

postgres?
      ( net-libs/courier-authlib )

ldap?
      ( net-libs/courier-authlib )

authlib?
      ( net-libs/courier-authlib )

fam?
      ( virtual/fam )

!gdbm?
      ( berkdb?
            ( >=sys-libs/db-3 )
       )

dev-lang/perl