On Fri, 30 Jan 1998, Bruce Bowler wrote:
= I know this was beat to death some while ago in the list but at the time, I
= didn't care (now, of course, I do) and now I can't seem to find it in the
= archives...
=
= We have a few users who on occasion work from home, dialed into an ISP.
= They want to be able to send and receive mail as if they were at work.
=
= I'm aware of the sender_net_accept_relay option to allow relays from some
= addresses but since the ISP's all use DHCP or some other dynamic addressing
= scheme, I can't be sure that xx.xx.xx.4 will always be "trusted user", so I
= have to allow the entire xx.xx.xx.0/24 range in. That's not really what I
= want.
=
= Is there a way to tell exim to accept relays from xx.xx.xx.0/24 but only if
= the from field is some set of values? Or is there a better way (sending
= their mail from the ISP isn't acceptable) to have a little more control
= over who sends from xx.xx.xx.0?
=
I've been running into this here. Most of my home users are using
eudora or netscape mail. My domain is math.ualberta.ca. I tell
them to leave their pop server set to vega.math.ualberta.ca, but
change their SMTP host to be mail.v-wave.com, and make their
Reply-To: point to their math department address.
Another way around it is to allow them to telnet to your domain,
then run pine or elm, or (shudder) mail in a terminal window.
The possible way around this would be to add a new variable
sender_address_accept_relay = <address list> so that
you could allow john@??? to relay through you.
This is not very secure, since, depending on ISP, you could spoof
a from fairly easily. (Log on, hack your eudora settings, transmit.)
I don't know if most ISP's verify that who people declare the mail to
be from and who it is from are the same or not.
Sherwood Botsford | email avatar@???
Sorcerers Apprentice | Office CAB 642B
System Administrator | Tel: 403 492 5728
Trouble shooter | Fax: 403 492 6826
--
*** Exim information can be found at
http://www.exim.org/ ***
