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Resolved Undelivered Mail Returned to Sender

Hello Forum, I resolved the issue but still some issues, I want to know where I should add the PTR record to solve this.
 

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What you added si a IP range/network mask. Why?
A PTR has to be set for IPv4 of server hostname.

I have no knowledge about your admin panel at your domain hoster. Please ask support of your domain hoster!
 
It won't take 3 days. That ought to be through within a few hours for most places. It can in some rare cases take up to 48 hours, but normally after a few hours most providers have already updated their routers.

Spamhaus: Your Plesk configuration for the HELO is correct. Just do not use the second option.
 
When I check with mail-tester I see these following errors and I have failed to understand the issue why SPAMHAUS continues to blacklist the domain
 
Last edited by a moderator:
The issue was resolved, and Spamhouse advised me to use my subdomain instead of a hostname in the SPF record.
 
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