Fix: Em Client Authentication Failed

On this page, we will discuss how to fix the “em Client authentication failed” error in detail.

In some situations, when you try to configure another account (such as an Exchange Online account) with eM Client, you will be unable to log in. You might get an error message indicating that the server was found, but the authentication failed. In this case, you will have to check your email address and password because this error message suggests that the wrong credentials have been used for authentication. See if you have entered these credentials correctly. If you have not, the “authentication failed” error will pop up. So, you need to enter the correct email address and password to fix the issue. This simple method has proved to be fruitful for many users.

Em Client Authentication Failed

Now, we will explore the other reasons behind the “em Client authentication failed” error and also try some troubleshooting methods to fix it.

Method 1: Check the security software on your computer:

If the authentication issue persists after you have entered the correct credentials, then you have to check the security software on your computer. Any security element in your network, like a firewall or proxy software, might hinder your logging into eM Client. So, if you are using such a security program on your computer, disable it temporarily. Now, check if the problem is solved.

If the issue persists, move on to the following method.

Method 2: Check your Incoming and Outgoing Ports:

In case you don’t have the correct port and security policy combination for your account, the “em Client authentication failed” error might occur. To fix the issue, you can use the following path in eM Client:


Em Client Authentication Failed

Here, you need to check your Incoming and Outgoing port numbers and also the security combinations (SSL/TLS) you have used for them.

If the error persists, move on to the next method.

Method 3: Changing your password

Some users report that changing their passwords to stronger ones has helped fix the current problem.

One user stated that after switching over to a stronger password, he could see two emails appear in his eM Client Inbox. He was also able to send emails.

Therefore, change your password and then check whether the “em Client authentication failed” error has been resolved. By now, it should be fixed.

You have now successfully solved the error “em Client authentication failed.”

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