Postfix Address Verification

[Seamus Allan]

I suspect I have solved the problem.
After trying to set up sender domain verification (to prevent stuff from 
abcd at fghi.com) I discovered that people who had their domains with us 
could not send email, giving a 430 Domain not found error. (Needless to 
say the phones started ringing immediately!). I then realised that 
Postfix wasn't using the relay map to determine whether a domain existed 
or not, it just did a dns lookup, in our case to our internal dns 
server. The internal DNS is used essentially only for the intranet and a 
few hostnames of servers, so most domains that it is 'authoritative' for 
only have A records for www.domain.com. So when postfix was querying to 
see whether domain.com existed, the DNS was giving no results and 
thusly, the 430 error popped up. After fixing the DNS up, the sender 
domain verification worked, and I have just turned on the recipient 
verification back on to see whether that is fixed too.

Cheers all

Seamus

-- 

*Seamus Allan*
Network Engineer
Rheel Electronics Ltd
Phone +64-3-386 3070 Fax +64-3-386-3071
Mobile +64-21-178-2980
seamus at rheelweb.co.nz
www.rheel.co.nz

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