Reverse DNS is not a valid Hostname

Hi, i need help with that, i have a error on testing on http://mxtoolbox.com or other similar testers.

The error is: B Reverse DNS is not a valid Hostname [/B]

now i have this config:

ipv4.mydomain.com A 1.1.1.1 43200
mail.mydomain.com A 1.1.1.1 43200
mydomain.com A 1.1.1.1 43200
ns1.mydomain.com A 1.1.1.2 43200
ns2.mydomain.com A 1.1.1.1 43200
ftp.mydomain.com CNAME mydomain.com 43200
www.mydomain.com CNAME mydomain.com 43200
mydomain.com NS ns1.mydomain.com 43200
mydomain.com NS ns2.mydomain.com 43200
mydomain.com MX 10 mail.mydomain.com 43200
1.1.1.1.in-addr.arpa PTR mydomain.com 43200
mydomain.com SOA ns1.mydomain.com hostmaster@mydomain.com 7200 300 1209600 10800 N/A
default._domainkey.mydomain.com TXT v=DKIM1; k=rsa; t=y; p=2 qYq SMa HTg DVR qRG JQj jtO lFw 9b/ …; 43200
_domainkey.mydomain.com TXT v=DKIM1; k=rsa; t=y; 43200
_dmarc.mydomain.com TXT v=DMARC1; p=none 43200
mydomain.com SPF v=spf1 a mx ip4:1.1.1.1 include:mail.mydomain.com ~all 43200
mydomain.com AAAA 2001:89tf:3:1e9f:: 43200
ipv6.mydomain.com AAAA 2001:89tf:3:1e9f::

AND my Mail Server Hostname (FQDN): mail.mydomain.com

How i need configure the dns? or how to fix that?

Hi dino

Welcome to IW forums

How you correct RDNS depends upon if you are delegated full control over your IP cidr/IP or not

If you have full delegated control (usually not for small cidr), you can set the PTR record in your DNS settings for domain.url

If you are not delegated control, you need to ask your IP address provider to set your RDNS as you need it

Many thanks

John

how can I know if i have full delegated control or not?
ok, and how it should be configured ?

somthing like this:
1.1.1.1.in-addr.arpa PTR mydomain.com 43200
or
1.1.1.1.in-addr.arpa PTR mail.mydomain.com 43200

or
1.1.1.1.in-addr.arpa PTR mydomain.com 43200
1.1.1.1.in-addr.arpa PTR mail.mydomain.com 43200

can you put an example please.

Hi Dino
I do not believe you have been delegated full control, your first post shows PTR but you have obscured the resolve/test, so can only go by guessing, and if you are not sure over PTR settings, then it points to no delegated control.
Delegated control are usually assigned to a /24 or /16 block, may have changed now, but it can be provider choice to delegate or not.
In any event, here is a PTR/RDNS for 1 of our IP
150.90.153.5.in-addr.arpa. PTR IN 7200 107ms ns1.sentmail.co.uk.
I would suggest you contact your IP address provider (network provider) and ask them to set the RDNS for you. Once they confirm set, wait a few hours and test, and it should show RDNS, but please make sure you request the correct FQDN to use for RDNS, which usually matches your mail server smtp greeting.
Many thanks
John

Thank you, your example helped me.
I entered my ip provider’s web site there i could set up what you said.

Reverse DNS is IP address mapping of a domain. Basically this has to be informed to your internet IP provider to point the IP to your domain.