Who is My Email Provider? Who Hosts My Email Domain?
How to find a website's DNS (name server) address - nixCraft
Reverse DNS Lookup - WhatIsMyIP.com®
Checking FQDN, Reverse-DNS/PTR, MX record - rtCamp
DNS Checker - DNS Check Propagation Tool
MX Lookup
Reverse DNS - MailGenius
What is Reverse DNS Lookup and How to Perform it?
DNS Records correlated to spamfiltering - NixTree
Create and check SPF record online
DNS Server Check Basics – Uptime.com
Setting up the Correct DNS Records for your Web or Mail Server | PeteNetLive
Understanding DNS Records in Email - MailerSend
![5 Online Tools to Check DNS Records - [Best DNS Checkers]](https://geekflare.com/wp-content/uploads/2021/11/dnschecker.jpg "5 Online Tools to Check DNS Records - [Best DNS Checkers]")
5 Online Tools to Check DNS Records - [Best DNS Checkers]
DNS settings for mail flow in Office 365 - MSB365
Direct send without SMTP relay server
Setting DNS records workaround.org
What Is DNS and How Does It Work – A Comprehensive Guide
Monitor DNS Records | DNS Check
DNS Lookup - Javatpoint
Monitor DNS Records | DNS Check
![SOLVED] Setting correct SMTP HELO host, domain name, PTR records for e-mail server - Support - NethServer Community](https://community.nethserver.org/uploads/db8506/optimized/3X/2/c/2caa171a789531734180ce90ffac6f8725f8fe0a_2_1024x484.png "SOLVED] Setting correct SMTP HELO host, domain name, PTR records for e-mail server - Support - NethServer Community")
SOLVED] Setting correct SMTP HELO host, domain name, PTR records for e-mail server - Support - NethServer Community
Reverse DNS and PTR record - ClouDNS Blog
