Hi,
I'm not sure this is the right place, but I got to start somewhere. The last few days we are noticing a lot of REJECTS in our mail-logs coming from messagelabs-hosts. For example:
Dec 7 10:32:53 postfix-blr29 postfix/smtpd[30769]: NOQUEUE: reject: RCPT from mail1.bemta32.messagelabs.com[195.245.230.65]: 450 4.7.1 <mail1.bemta32.sdw.messagelabs.com>: Helo command rejected: Host not found; from=<sender@email1.com> to=<receiver@email2.com>After checking
mail1.bemta32.sdw.messagelabs.com, it does not resolve (A/AAAA/CNAME) indeed.
After a few rejects, we see a successful delivery from host
mail1.bemta36.messagelabs.com which has its records setup correctly. Tho, this doesn't seem to be a retry, but a new email, resulting in the loss of the previously rejected email (so it seems).
This resolver-check is a very good way to fight a lot of spam messages, so disabling this check is a no-op.
Why doesn't messageLabs configure their DNS correctly? Or is there something else going on?
Thanks,
Gino