Reverse dns record in my dns configuration

I need to add a reverse dns record in my dns configuration.

I am getting this error is the ip of the mail server

Remote host said: 451 4.1.8 Possibly forged hostname for

I have access to the dns zone  of the domain

Any ideas
Who is Participating?
Tom CieslikConnect With a Mentor IT EngineerCommented:
If you talking about external DNS in your registrar record, then they are creating reverse zone automatically.
I think something is missing in your DNS setting

Make sure you have A record for you email server name with IP
autodiscover      7200
email      3600

Make sure you have MX record configured
Make sure you have TXT record for your email server

v=spf1 ip4: ptr ~all
robrodpAuthor Commented:
Thx for the insight all is working ok now
PTR record cannot be created by your domain dns panel
it has to created by ISP who owns the public ip address used by you to send emails out
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nociSoftware EngineerCommented:
This is stil no reverse lookup...  for that you need a PTR record.
robrodpAuthor Commented:
What tool can I use to check this issue?
nociSoftware EngineerCommented:
dig    -x

(dig is a DNS query tool)
has various checks...,  look for a  & ptr.  like in:

(which tells  which means you mail server needs to present that name as HELO (EHLO) announcement.
robrodpAuthor Commented:
How can I check if my mail server presents as HELO (EHLO) announcement?

Or is the mxtoolbox returning that ptr means it is ok?
nociSoftware EngineerCommented:
No MXtoolbox only checks DNS entries. That should be in the configuration...
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