ptr with 2 domain names

Discuss your pilot or production implementation with other Zimbra admins or our engineers.
pattonb
Posts: 15
Joined: Sat Jul 01, 2017 3:09 am
ZCS/ZD Version: 8.7.6

ptr with 2 domain names

Postby pattonb » Mon Aug 19, 2019 2:45 pm

How does 1 best handle a ptr record with 2 fqdn ?
in an attempt to avoid 'false positive' in ptr lookup ?


phoenix
Ambassador
Ambassador
Posts: 26342
Joined: Fri Sep 12, 2014 9:56 pm
Location: Liverpool, England

Re: ptr with 2 domain names

Postby phoenix » Mon Aug 19, 2019 3:37 pm

You don't do that, you have one PTR record to the FQDN of the server for the primary Domain on your ZCS server. You could have found the answer with an internet search such as this: https://www.startpage.com/do/dsearch?query=ptr+dns+records+two+fqdns&cat=web&pl=opensearch&language=english ... and specifically this answer: https://serverfault.com/questions/618700/why-multiple-ptr-records-in-dns-is-not-recommended

It would help if you had actually described in detail what you were trying to do and why you think it was necessary.
Regards

Bill

Rspamd: A high performance spamassassin replacement

If you'd like to see this implemented in a future version of ZCS then please vote on Bugzilla entries 97706 & 108168
pattonb
Posts: 15
Joined: Sat Jul 01, 2017 3:09 am
ZCS/ZD Version: 8.7.6

Re: ptr with 2 domain names

Postby pattonb » Mon Aug 19, 2019 3:45 pm

I know that, I am inquiring as to how you deal with a mail server that does have 2 fqdn.
I thought there was an rfc, that prohibits more than 1 fqdn per ip.
Here is the ip. 198.160.191.65 ( mailserver trying to send email to a domain I host)

as I have zimbra doing a reverse lookup, it rejects the incoming email, as the 2nd fqdn is the correct answer.
gdr777
Posts: 8
Joined: Sat Sep 13, 2014 12:36 am

Re: ptr with 2 domain names

Postby gdr777 » Mon Aug 19, 2019 8:07 pm

You would probably have to whitelist that IP as described here:

https://wiki.zimbra.com/wiki/IP_Address_whitelisting

Which isn't ideal if that host is actually a source of spam in addition to legitimate email.

Return to “Administrators”

Who is online

Users browsing this forum: No registered users and 6 guests