 |  |
>So as others get some value out of this thread :) - how does
Re: We do not relay
From: Men & Mice Support
Date: Monday, January 31, 2000
Time: 9:32:00 pm
>freeserve.co.uk exist without MX records.
>
>> burlingtonthl.freeserve.co.uk. MX 2 mail-in.pol.net.uk.
>> mail-in.pol.net.uk. A 195.92.193.213
>> mail-in.pol.net.uk. A 195.92.195.179
>> mail-in.pol.net.uk. A 195.92.193.24
>> mail-in.pol.net.uk. A 195.92.195.180
>> mail-in.pol.net.uk. A 195.92.193.21
>> mail-in.pol.net.uk. A 195.92.195.181
I would guess that nobody has an address of the form user@freeserve.co.uk. They must instead have addresses of the form user@burlingtonth1.freeserve.co.uk (or other regional freeserve office names).
>Also is it OK to have multiple ip numbers for a host, how would the
>reverse look-up work out when a mail server does a "verify return
>path"?
It's OK for a hostname to resolve to multiple addresses. This is one way to load share a web site across multiple servers, for example.
Since these are incoming servers only, I would guess that return paths are not verified. For those who are curious, here are the relevant PTR records:
21.193.92.195.in-addr.arpa. PTR mail7.svr.pol.co.uk.
213.193.92.195.in-addr.arpa. PTR mail8.svr.pol.co.uk.
24.193.92.195.in-addr.arpa. PTR mail13.svr.pol.co.uk.
179.195.92.195.in-addr.arpa. PTR imailg1.svr.pol.co.uk.
180.195.92.195.in-addr.arpa. PTR imailg2.svr.pol.co.uk.
181.195.92.195.in-addr.arpa. PTR imailg3.svr.pol.co.uk.
Furthermore, these names do indeed resolve back to the addresses in question, in a one-name-to-one-address fashion.
____________________________________________________________________
Chris Buxton cbuxton@menandmice.com
Men & Mice http://www.menandmice.com
Makers of: QuickDNS Pro
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