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Correct way to set PTR DNS record for mail forwarding

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I'd tried to set up mail forwarding from my Postfix server to Gmail. I'm getting the next error from Google server:

'The IP address sending this message does not have a PTR record setup, or the corresponding forward DNS entry does not match the sending IP.'

I've seen an instruction on the support page (section named 'PTR records') there:

https://support.squarespace.com/hc/en-us/articles/360002101888-Adding-custom-DNS-records-to-your-Squarespace-managed-domain

It advises to set up next values:

  • In the Type dropdown menu, select PTR.
  • In the Host field, enter @.
  • From the TTL dropdown menu, select 1 hour. (What is it? There aren't any dropdowns.)
  • In the Data field, enter data from your provider. (Which data? An IP address? A domain name? An IP address with '.in-addr.arpa'?)

I've tried to enter different combinations of values, like:

  • Host: '@', Data: DOMAIN
  • Host: '@', Data: IP
  • Host: IP, Data: DOMAIN
  • Host: IP.in-addr.arpa, Data: DOMAIN
  • Host: DOMAIN, Data: IP
  • Host: DOMAIN, Data: IP.in-addr.arpa

But the result was the same.

What values should I use to correctly set the PTR record?

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