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boricuaking55_1's avatar
boricuaking55_1
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Feb 14, 2014

Regarding PTR records for mail gateways and ZoneRunner...

I have a question regarding reverse lookups (and by extension SPF records) for mail gateways in an F5 GTM\LTM deployment scenario.   We have decided to implement 2 F5 load balancers in a pool in o...
application delivery
BIG-IP DNS
deployment
LTM
Cory_50405's avatar
Cory_50405
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Feb 14, 2014

Your SPF record should include all email relay hostnames that will relay mail for your domain. As long as you ensure there's a PTR in place for each sending mail server IP address, and that PTR specifies the hostname of the email relay, then you should be good.

 

If you can provide more details on your current SPF record and how many email relays you have, I can help ensure you are all setup properly.

 

  • boricuaking55_1's avatar
    boricuaking55_1
    Icon for Nimbostratus rankNimbostratus
    Feb 14, 2014
    Thank you for your answer Cory. We actually do not have an SPF record set that contains the mail gateway host-names (2 nodes, each with an IP address on each link). Our current plan is to update the PTR record for the secondary link IPs with the two host-names (they are using temporary filler names as of this moment)
  • Cory_50405's avatar
    Cory_50405
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    Feb 14, 2014
    Just for clarity, reverse lookups (PTR) and SPF (TXT) records are two separate things, both of which receiving mail servers usually check. Some mail servers will not accept mail from your domain unless it finds an SPF record. I've encountered some that will always mark messages as spam unless there's an SPF record in place. It's definitely a good idea to create PTR records for your secondary IP addresses, but you really should create an SPF record as well.