Solved: Thunderbird Email Error 5.1.1

Thunderbird Email Error 5.1.1
  • Step 1: Thunderbird is a free and open-source email client application that lets you manage your mail account, news feeds, chat, etc. Most of the users encounter Thunderbird mail error 5.1.1 in Thuderbird while accessing it with Comcast. This error occurs if emails are sent to invalid email addresses.
  • Step 2:To solve this issue, check if the email account to which you are sending the email is valid or not.
  • Step 3:But, the Thunderbird email application can’t identify the email account is valid or not.
  • Step 4:To do it, you can use the ThunderPlunger add-on. This add-on will help you to identify the invalid addresses present on your Thunderbird account.
  • Step 5:Using this add-on application, you can also remove orphaned news files, clean email accounts, edit email addresses, validate an email address, and so on.
  • Step 6:The ThunderPlunger add-on is compatible with Thunderbird versions 1.5 to 57.0.
  • Step 7:To know how to use the ThunderPluger add-ons to fix the Thunderbird mail error 5.1.1, follow the instructions given below.

Download the ThunderPluger add-on:

  • Step 1:You can download the ThunderPlunger add-on from its official site.
  • Step 2:Go to the ThunderPlunger application’s official site using a web browser.
  • Step 3:Click the Download Now button.
  • Step 4:If the version type displayed below the Download button does not match with your Thunderbird application's version, click the View other versions or Download Anyway command line.

Install and use:

  • Step 1:After downloading the ThunderPlunger add-on, open it and perform the configuration process as instructed on the screen.
  • Step 2:Once you have configured the add-on successfully, you can utilize it to identify the invalid email accounts present on your Thunderbird account’s contact list.
  • Step 3:Select and remove the invalid account from Thunderbird.
  • Step 4:After that, try to send an email to a valid email account and check if the error has been solved.
  • Step 5:If the Thunderbird mail error 5.1.1 persists, contact us.

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