30 Jul
2013
30 Jul
'13
11:37 p.m.
On 30/07/13 21:05, Nigel Rantor wrote:
Further to on-list discussions another sysadmin friend of mine
suggested that the fact that the A record for my MX doesn't match the
PTR record might be an issue but I feel it is a red herring.
I'm pretty sure multiple PTR records is not allowed (or at least
discouraged) anyway, which means I would need to start using the real
name of my machine for the MX record instead of the one I am using.
This isn't that much of a problem really, just means I don't have a
nice 'mail.*' MX entry.
Actually it's not such a red herring - a mail server with an A record
without a corresponding PTR record will more often than not be
disallowed to send mail. It is a very basic security check, one of the
many I do in order to keep spam at bay. Most mail senders with a
misconfiguration like this tends to be compromised hosts that spews UCE,
so if it is within your power to fix your DNS, please do so.
--
Regards,
Jan Henkins