In the Account Setting wizard, you have to choose the Outgoing Server(SMTP) from the left panel.Ħ. Here, click on the Options and select the Account Setting option.ĥ. Or, you can also click on the setting bars in the top-right corner.Ĥ. Now, go to Tools and opt for the Account Settings option.ģ. First of all, start the Thunderbird application to remove Thunderbird email problems sending when the mailbox is full of storage.Ģ. Just try the method and work with Thunderbird Mail clients efficiently and move Thunderbird to a new computer. All the solutions are 100% secure, and there are no chances of data loss. These are the most researched and appropriate methods to fix Thunderbird can’t send email issues.
Blocked Port 25 by ISP (Internet Service Provider)īest Methods to Fix Thunderbird Can’t Send Email. Inappropriate Thunderbird Settings may also be a reason behind the issue. Thunderbird Sending of message failed SMTP server timed out happens while traveling and linking with a different ISP from a normal one. Please verify that your Outgoing server (SMTP) settings are correct and try again because there is a chance that Thunderbird outgoing server timed out. 
Possibility of issue occurs because Thunderbird cannot send mail the connection to the outgoing server failed. Thunderbird SMTP error message also pop-up due to incorrect configuration of the account. The problem suddenly started after updating Thunderbird to their latest version,i.e., version 78. Sometimes, users cannot send emails, while once can compose a message, send it, and get an error. These are several common issues behind the issue Thunderbird stopped working. Thunderbird Sending of Message Failed- Let’s Discuss the Reasons An Alternate Solution to Troubleshoot Thunderbird won’t send Email. Why Manual Ways to Fix the Thunderbird can’t send emails is not Recommended Mostly?. Method 4: Delete the Set Password on SMTP. Method 3: Make Sure that There is Nothing in the Blocking Mails Folder. Method 2: Check that the Correct SMTP Setting or Not. Best Methods to Fix Thunderbird Can’t Send Email. 
Thunderbird Sending of Message Failed- Let’s Discuss the Reasons.This took quite a while to debug, as Thunderbird has no built in options for connecting to Exchange servers, hence you have to set up IMAP and SMTP.īelow is my working configuration at the time of writing.
For some reason, Office365 domains are not recognised by default by Thunderbird and such the automatic configuration doesn't work. Recently I had to use an Office 365 mail account with Mozilla Thunderbird.
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