Fix Eudora authentication failed error with these simple solutions

With the latest release of Eudora for Mac OS X, you are getting a feature that only a few email services can boast: Push email. This means Eudora is checking for new email at regular intervals and if a new message arrives, it’s pushed to your computer, meaning you’ll read it much faster than with most other services. So what happens if you try to log in to your Eudora account but get an authentication failed error? There are a few simple solutions to this issue you can try before you contact customer service for help.

Eudora was one of the first email applications that could be used by the common people. The email application was developed by Steve Dorner and was released for the first time in 1991. The application allows you to send and receive emails. But sometimes, when you try to connect with Eudora, it might fail. Some of the reasons why you might be facing this error are the username and the password are incorrect or the server is down.

  1. Start Eudora and go to Extras.
  2. Click on Options > Ports. The default port is set to 25. Make sure you enter the correct port for your ISP.
  3. Enable the Allow authentication option in the SMTP server section.

Then the deudora.ini file must be modified and CRAM-MD5 disabled. Here’s how.

  1. Go to C:ProgramFiles(x86) QualcommEudora (Windows 64 bits) or C:ProgramFilesQualcommEudora (Windows 32 bits).
  2. Find the file named deudora.ini. Double-click to open the file in Notepad.
  3. Insert the following line of code before the [Settings] line.
    • SmtpAuthBanished=CRAM-MD5
  4. Press Ctrl + S to save and close the file.
  5. Start Eudora and see if the authentication problem is resolved.

2. Use another port

If you still get the error message Eudora authentication failed, try a different combination of available ports for your mail server.

  1. Start Eudora and choose Options > Login.
  2. Check the use of the transmission port (587). Under Secure Socket when sending, select STARTTLS required.
  3. Test the improvements. If not, go to the next step.
  4. Deselect the Use mail port (587) check box. Under Protect sockets when sending, select Never. Try again if the e-mail client works. If not, go to the next step.
  5. Make sure that the Use mail port (587) check box is not selected.  Select the desired alternate port option.

3. Diagnostic link interlock

If the security software installed on your computer blocks the ports for connecting to the mail server, it may help to deactivate security programs such as firewall and antivirus. However, to find out if the program is blocking ports, you can run a terminal and telnet.

  1. Press Windows + R. Type cmd and press Enter.
  2. On the command line, type the following command and press Enter :
    • telnet 25
  3. If you get the message 220 ESMTP Postfix [ NO UBE C=GB ] You are not allowed to send spam through this server, it means that the ports are working properly.

If you do not see the message, try the following solution to disable the security software on your computer. Message: Telnet can be disabled by default in newer versions of Windows, including Windows 10. If you receive a Telnet message that is not recognized as an internal or external command, here is how to enable Telnet on computers running Windows 7 and higher.

  1. Open the Control Panel via Cortana/Search.
  2. Go to Programs > Programs and Features.
  3. In the left pane, click Turn Windows features on or off.
  4. In the new dialog box, find Telnet and check the box to enable Telnet.
  5. Click OK and wait for the changes to be applied.

4. Disable firewall

If you have an antivirus program with an active firewall installed, this may cause an error in Eudora authentication. One way to resolve compatibility issues is to temporarily disable the firewall. If you do not have a virus firewall enabled, disable the Windows Defender firewall. Here’s how.

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