Dear list,
I'd like to bounce an idea regarding SMTP AUTH off you all, just to
see if it's possible and that I'm not wasting my time, as the spec
doesn't seem to cover the situation.
I have a vaguely unconventional hubbed setup for mail delivery.
The MX records for my domain are as follows:
submonkey.net. IN MX 20 shaft.techsupport.co.uk.
submonkey.net. IN MX 30 mailrelay1-gui.server.ntli.net.
shaft.techsupport.co.uk then passes the mail, via a routing entry to
my machine at home, which is on a dynamic IP with a hostname from dyndns.org.
Here comes the part I'm wondering about.
Since my IP address is dynamic, what I'd like to do is set up the host
shaft.techsupport.co.uk to ensure that my machine is the only machine
that it delivers my mail to - SMTP AUTH would seem to be the thing for
this. However, it seems that exim will always fall back to transmitting
the message over an unauthenicated session if SMTP auth fails - I don't
want that and would like shaft.techsupport.co.uk to refuse to deliver the
message unless it has determined that it is really talking to my machine.
Is this possible with exim, or would I be better off looking at something
like IPsec between the two machines ?
Thanks,
Ceri
