Email Errors – Cannot Send/Receive Emails

You may encounter issues when sending and receiving emails when using third party email clients like Outlook, Mail for Mac, Thunderbird, etc. You can go to this link on how to edit your mail servers, or check the following that can be done to fix the issue: 

• Check incoming and outgoing mail servers are correct as well as port numbers 
• Check DNS Records of the domain name and make sure MX Record is correct 
• Check if the username and password 
• Turn off firewall or anti-virus that are running 
• Check connectivity with the internet 
• Do a telnet check to see if server and ports are not blocked 

What Is Telnet? 

Telnet is a computer protocol that was created to interact with remote computers. This allow users to test connectivity and issue commands. It is one of the simplest ways to check connectivity to certain ports. 

Here’s how you run telnet commend for Windows and Mac:

Windows

Step 1. Search for Control Panel.

Step 2. Click Turn Windows features on or off. 

Step 4. Once changes are done, open Command Prompt. Or search for cmd. 
Step 5. Type the following: 

telnet<space>yourservername.com<space>portnumber  

Check image below:

If the port is not blocked, you get the result below: 

Otherwise, it will return an error message. Take a screenshot and contact your ISP (Internet Service Provider) to unblock the port. You may provide the screenshot result for proof. 

Mac

Step 1. Open your Terminal.
Step 2. Type the following: 

telnet<space>yourservername.com<space>portnumber 

Check image below:

If the port is not blocked, you get the result below: 

Otherwise, it will return an error message. Take a screenshot and contact your ISP (Internet Service Provider) to unblock the port. You may provide the screenshot result for proof.