On Tue, Nov 10, 2015 at 09:29:19PM +0100, Zalezny Niezalezny wrote:
> We have two systems which are dedicated only to send E-mails. Mostly for
> massmailing. These two machines will not receive any E-mails.
Don't confuse "systems" (SMTP servers) with email domains (the
domain part of an rfc822 email address). Your *systems* do not
need MX records. They just need FQDN hostnames, and their IP
addresses need to a PTR record that provides each system's hostname.
Nor do the MX records of the envelope sender domain of the message
being sent need to point at the sending systems. It is not unusual
to have separate systems sending and receiving mail.
> Do we realy
> need to configure MX records for that systems if they are not receiving any
> E-mails?
No MX records are required for your *systems* (SMTP servers).
> From my point of view checking MX record from the client which
> sending message is ... strange... if not stupid... In the SPF record we can
> have a lot of systems which are not necesserly configured in the MX record.
If you have SPF records for the envelope sender domain, then the
sending IP addresses should be listed there. In any case the
envelope sender domain need to resolve to a set of valid public
addresses or a set of MX hosts with valid public addresses.
--
Viktor.
