Reverse DNS is not a valid Hostname

Question

Hello,

I have been trying to fix issues with Reverse Dns. I’m running VirtualMin on CentOS 7.

I have renamed my droplet to hostname.com (soundstroke.ng) i don’t know what else to do i have followed so many tutorials on this but doesn’t work.

Please what should i do?

Answer 1

northivanastan November 23, 2018

This question is a bit confusing.

I’m able to perform a DNS lookup on soundstroke.ng, then a reverse DNS lookup on the resulting IP address and that works.

The hostname of your droplet doesn’t matter all that much; it’s simply the internal name of your droplet and how it will be accessed on the droplet’s internal network…

Which tutorials are you using? What exactly are you trying to do?

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Samuelseggs November 24, 2018

Actually the main issue was that each time i send a mail it keeps getting registered as spam

I tried to follow this issue but no joy still
https://www.digitalocean.com/community/questions/email-gets-registered-as-spam

I tired to lookup my domain on https://mxtoolbox.com/SuperTool.aspx?action=mx%3asoundstroke.ng&run=toolpage and did stmp test and still get “Reverse DNS is not a valid Hostname”
Reply Report
- northivanastan November 24, 2018
  
  I did some searching, and it seems like MXToolbox and some mail clients want a separate IP and subdomain for the mail server. So mail.soundstroke.ng needs a different IP from soundstroke.ng. There are various ways to do that.
  
  Another possible reason your mail is marked with spam is the lack of TLS support. This might be helpful: Certbot
  
  Another possible (but unlikely) reason is that some mail clients block uncommon email domains. Not much you can do about that.
  
  I’m not experienced with email though, so that’s all I can say.
  
  Reply Report

Answer 2

Samuelseggs November 24, 2018

Actually the main issue was that each time i send a mail it keeps getting registered as spam

I tried to follow this issue but no joy still
https://www.digitalocean.com/community/questions/email-gets-registered-as-spam

I tired to lookup my domain on https://mxtoolbox.com/SuperTool.aspx?action=mx%3asoundstroke.ng&run=toolpage and did stmp test and still get “Reverse DNS is not a valid Hostname”
Reply Report
- northivanastan November 24, 2018
  
  I did some searching, and it seems like MXToolbox and some mail clients want a separate IP and subdomain for the mail server. So mail.soundstroke.ng needs a different IP from soundstroke.ng. There are various ways to do that.
  
  Another possible reason your mail is marked with spam is the lack of TLS support. This might be helpful: Certbot
  
  Another possible (but unlikely) reason is that some mail clients block uncommon email domains. Not much you can do about that.
  
  I’m not experienced with email though, so that’s all I can say.
  
  Reply Report

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