[clug] DNS + CNAMES + sendmail...

Andrew Janke a.janke at gmail.com
Wed Aug 5 07:13:47 MDT 2009

Hi all,

For reasons that are somewhat long I have inherited a situation like this...

bob.blix.com.au is a CNAME pointing to mary.blix.com.au
the MX record for bob.blix.com.au is mary.blix.com.au

mary.blix.com.au is a real machine with a real (outward facing and
resolvable) IP
bob.blix.com.au resolves and works fine as a web server.

Then comes my favourite friend sendmail...

I can use MASQUERADE_DOMAIN to make outgoing mail (From
user at mary.blix.com.au) appear to come from user at bob.blix.com.au but
incoming mail is somewhat more difficult as I think sendmail is
resolving bob.blix.com.au to mary.blix.com.au meaning the To: field
contains user at mary.blix.com.au which is the "wrong thing" [1].

So first question:

1. Should I just give up, dump the CNAME and change mary.blix.com.au
to bob.blix.com.au and go through a (sizeable) amount of pain making
everything work..

If no.

2. How can I make sendmail rewrite the To: field to what I want?
(username at bob.blix.com.au)


Andrew Janke
(a.janke at gmail.com || http://a.janke.googlepages.com/)
Canberra->Australia    +61 (402) 700 883

[1] Where of course wrong thing is defined as not what I want

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