Cannot Send Messages in Thunderbird

Cannot Send Messages in Thunderbird

Thunderbird is free desktop email from Mozilla. It is successful web browser to send or receive emails, documents with many interesting and advanced features. And provides full privacy and security from the hackers.

Sending Message

  • Go to the Thunderbird toolbar
  • Click on write to open the write window
  • Go in the “To” box and type email address, you want to send the message
  • Go to “Subject” box and type the subject of the message
  • Now start typing the message in the message box
  • Then click on “send” 

SMTP Email Outgoing Settings

  • Open Mozilla Thunderbird and click on tools
  • Go to menu and select account settings
  • Now click on outgoing server (SMTP)
  • Check the server settings to configure correctly
  • Check the email provider website and for mail settings and SMTP

Check SMTP Settings

  • Open Thunderbird and click on tools
  • Select account settings and account name
  • Make sure your SMTP server setting is correct

Check Email Blocking Services

  • Send an email without disabling any antivirus or firewall
  • Change the port number 465 or 587, many ISPs block the outgoing email from port 25

Delete SMTP Password

  • Install the latest version
  • Now send an email to check the problem
  • If there is problem, select tools then options
  • Go to wizard and click on security then password
  • Delete the SMTP password and configure the email account again
  • Now send the email again to check the problem

Reset SMTP Password

  • Open the Thunderbird and go to the ISP site
  • Click on reset password, change the password
  • Then add a new password
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28 thoughts on “Cannot Send Messages in Thunderbird”

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  27. I’m wondering if anyone else has come across this issue and has found a work round or fix.

    I’ve installed Mac OS 10.15.1 Catalina on a separate partition on my computer and have installed all the usual software I need.
    I’ve downloaded and installed the latest version of Thunderbird – version 68.2.2.

    Under the Mac OS 10.14 Mojave partition the Thunderbird version running is version 60.9.1 and that loads all my profiles stored on the NAS server on the local network without any problem.

    However, when I try to load any of those server located profiles using Thunderbird 68.2.2 under Mac OS 10.15.1 Catalina all I get is a blank Thunderbird window. If I load Thunderbird 60.9.1 under Mac OS 10.15.1 Catalina the profiles open without a problem albeit the program seems to run more slowly than under Mac OS Mojave.

    Any assistance would be greatly appreciated.

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