Best Online Tools For Troubleshoot Email

troubleshoot email

As a Linux System administrator it is important to have in your bookmarks the Best Online Tools for Troubleshoot Email issues. Being used almost by everyone, the email is one of the pioneer Internet services that got the Internet so popular today.

The first email was sent on 1971 by Ray Tomlinson and it included the @ to separate the name of the user and the user’s machine.

Even so, with the instant messaging services like WhatsApp growing every day about 306.4 billion emails were sent and received each day in 2020.

This figure is expected to increase to over 376.4 billion daily mails by 2025. See the chart below:

email usage

The MXToolBox online tool for troubleshooting email

MXToolBox is my first choice for solving email issues. I use it to validate the DNS MX records, or test the mail server IP for DNS Blacklist and for SMTP diagnose.

To Lookup for your MX record just type your domain name and Click on the “MX Lookup” button.

mx lookup - email troubleshoot

It just takes a few seconds to complete and it will output your MX record and the IP address. This is an example of the result:

mx record - email troubleshooting

The Email DNS Blacklist lookup

To fight back the spam, many mail servers relay on the DNSBL or RBL (Real-time Blackhole List) services.

DNSBL is a service whereby with a simple DNS query, mail servers can check if a sending IP address is on a blacklist of IP addresses reputed to send email spam.

This blacklisting can give you a headache if you don’t identify where is it coming from. It will stop your emails from reaching it’s destination.

In order to validate if your mail server IP is Backlisted, just type your domain and Click on the “Blacklist Check” button.

email troubleshoot dns rbl

It will display about 100 servers reply, you should be good if they are all green. But, if you get one red you should click on the reason and follow their delisting procedures in order to be able to fix this email blacklisting issue.


I recommend you to keep your Online Tools For Troubleshoot Email in a easy to access place on your Bookmarks for future reference.

If you to want learn more about this tutorial or have any questions, feel free to send your comments down below.

Don’t forget to check our other Tutorials, we are constantly submitting new ones every week.

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