Am 06.01.2015 um 22:52 schrieb James B. Byrne:
On Tue, January 6, 2015 15:08, Roman Gelfand wrote:
I do run dns server on both client machines.
The dig response of the client machine from the client machine that
connects immediately has one more entry. It is bringing back an A
record of the client machine.
As it turns out that was the issue. I am not sure why. If you could
explain it, I would appreciate it.
I do not know why, but I can speculate that postfix checks for an A
record if certain checks are enabled, or perhaps it does so
regardless, and then has to go look for an MX record if it does not
find it. Two lookups plus a possible timeout value
postfix always checks for the PTR and A-record of the connecting IP
otherwise logging like below would not be possible
proper working name resolution is a basic requirement
Jan 6 22:29:50 mail-gw postfix/smtpd[15616]: warning: hostname
server4.vivahostingworld.com does not resolve to address 103.238.216.215
