>The issue for me, however, is that I need to allow relaying for mobile
>users dialing into the internet from national ISPs, thus usually ending
> up with different IPs each time they dial in.)
The solution is simple, and often overlooked, and often asked on this
list. Maybe somebody should write a "Life with email" document ;-)
If they have dialin access through a "national ISP" then that ISP most
certainly has a relaying SMTP server that they can designate in their MUA
as their SMTP server. There is no reason on earth that they should have
to relay back through the home office server, unless their ISP sucks.
You do _NOT_ have to send outgoing mail through the machine that is your
_INCOMING_ mail server!
OK, there may be some clues in the mail header that the email was not sent
from the home office, but who cares? These people are on the road! If
they know how to configure a MUA than the return address will look OK and
nobody will care or notice.
--Pete
