Wietse Venema via Postfix-users:
> > Also, would check_recipient_mx_addres query just one MX record (the one
> > with the highest priority)?
>
> check_recipient_mx_addres matches MX hostnames in the order as received.
check_recipient_mx_addres tries to match an MX hostname (in MX
record) against the tcp_table, before tries to match its IP address
(from A or AAAA recored) against the tcp_table. Then it tries the next
MX hostname, and so on.
The tcp_table should therefore always reply with a 'FOUND' result,
so that check_recipient_mx_addres never does any address lookups.
Your tcp_table should not return NOTFOUND because that can result
in many tcp_table lookups per recipient, like nr of MX rcords plus
nr of address records for all MX hosts combined.
Wietse
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