In such case, usually there is nothing wrong with a stored SMTP password in Thunderbird (see above). However, don't do this as a first step, especially if you cannot send messages after updating Thunderbird while you previously could. Thunderbird 78 FAQ – After upgrading to Thunderbird 78, I cannot get or send email messages Delete SMTP Password You can temporarily lower the bar to check if this is the reason for your problem (which obviously reduces security, so it's not recommended). If your provider does not support the newer versions of the protocol, sending and receiving of messages may fail. Verify that your mail server supports the minimum version of TLSĪs of version 78, Thunderbird expects higher security standards for the so-called TLS network encryption protocol. Contact your ISP's support to see if they are blocking your outgoing email port. You may have to switch to another port (e.g. Many ISPs block outgoing email on port 25.Remove Thunderbird from your program's list of trusted or recognized programs, then add it back manually or when prompted to resolve this.Note: Software blocking outgoing email is a common cause of not being able to send messages after updating Thunderbird, since it may be set to trust the previous version of Thunderbird but no longer recognize the updated version as trusted. Try briefly turning both antivirus, VPN, proxy and firewall software off, sending a test email, and turning them on and sending another test email.Verify that your outgoing email is not being blocked by your firewall, VPN, proxy, antivirus software (which sometimes implements a proxy and intercepts email) or your Internet Service Provider: Verify that your outgoing email is not being blocked For example, you cannot send a mail from through Yahoo's SMTP server. Most of the time, you cannot send messages from one account provider using another account provider's service. Verify that you are using the right SMTP server for the email address.
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