Noel Jones wrote:
... more likely nobody cares, because postfix behavior is documented.
When the relayhost is a hostname enclosed by "[ ]" brackets, postfix
asks for an A record and does not ask for an MX record.
If relayhost is an IP address enclosed by brackets, postfix uses that
IP with no additional lookups.
If realyhost is a hostname with no brackets, postfix will request an
MX record, if no MX exists, postfix will then request an A record.
If relayhost is an IP address with no brackets, postfix will request a
PTR lookup to find the hostname, then request an MX lookup on that
hostname. If no MX record exists, then an A record is requested for
the hostname. Either the MX lookup or the A lookup may return a
result different from the original bare IP; this is why you should
always enclose a literal IP address relayhost in brackets.
Actual lookups are performed by system libraries, not by postfix.
Now, exactly this was my problem - i could not find the above
information.. Only the small entry about relayhost ...
Could you point me to your source?
Thanx!
