If your email is failing to send in Thunderbird, it could be due to several reasons:
Outdated Thunderbird Version: Sometimes, new updates may interfere with the email-sending service.
Incorrect SMTP Settings: Outgoing server (SMTP) settings may be incorrect.
Misconfigured Accounts: Some SMTP errors can occur due to incorrect account setup.
ISP Restrictions: Some Internet Service Providers shut down one or many ports like Port 25 due to which emails cannot be sent.
Switching ISPs: Constantly connecting to different ISPs while traveling can disrupt email sending.
To resolve this Thunderbird can’t send email error, follow these steps:
Check and Verify SMTP Settings: Make sure that the SMTP settings of your Thunderbird account are correct.
Verify the Correct SMTP Server: Check that you are using the right server for your email account.
Check for Third-Party Applications Blocking Emails: Firewalls or antivirus software may block sending emails after any update. Deactivate them for a while and try to send the email again.
Update Thunderbird: Ensure that you are using the latest version because older versions tend to suffer more compatibility issues. In case updating doesn't work, then you should try to change your SMTP password.
Delete and Reset SMTP Password: I advise you to remove the saved SMTP password and type it again using your ISP's support page.
If manual solutions don’t work, try using the MigrateEmails Thunderbird Backup Tool to back up or transfer your mailbox to another email program. It is safe for data migration and has such special filters and options as duplicate email removal and the definition of certain dates.
Outdated Thunderbird Version: Sometimes, new updates may interfere with the email-sending service.
Incorrect SMTP Settings: Outgoing server (SMTP) settings may be incorrect.
Misconfigured Accounts: Some SMTP errors can occur due to incorrect account setup.
ISP Restrictions: Some Internet Service Providers shut down one or many ports like Port 25 due to which emails cannot be sent.
Switching ISPs: Constantly connecting to different ISPs while traveling can disrupt email sending.
To resolve this Thunderbird can’t send email error, follow these steps:
Check and Verify SMTP Settings: Make sure that the SMTP settings of your Thunderbird account are correct.
Verify the Correct SMTP Server: Check that you are using the right server for your email account.
Check for Third-Party Applications Blocking Emails: Firewalls or antivirus software may block sending emails after any update. Deactivate them for a while and try to send the email again.
Update Thunderbird: Ensure that you are using the latest version because older versions tend to suffer more compatibility issues. In case updating doesn't work, then you should try to change your SMTP password.
Delete and Reset SMTP Password: I advise you to remove the saved SMTP password and type it again using your ISP's support page.
If manual solutions don’t work, try using the MigrateEmails Thunderbird Backup Tool to back up or transfer your mailbox to another email program. It is safe for data migration and has such special filters and options as duplicate email removal and the definition of certain dates.
