Thunderbird requires password each time email is sent

Is this only during sending, or on receiving, too? Confirm that your SMTP settings are correct, according to their recommended settings page ( https://help.earthlink.net/portal/en/kb/articles/email-server-setting ): Outgoing Server: smtpauth.earthlink.net Outgoing Port Number: 587 Outgoing Security Setting: STARTTLS Authentication is Required: Use your full email address and password. (I notice that Thunderbird might suggest for Authentication, "Encrypted Password." I think that may be a mistake, because you're already using encrypted STARTTLS. Start off with "Normal Password" and if that doesn't work, try "Encrypted Password.") If they are correct, try this: - Make sure cookies are allowed (<Settings | Privacy & Security | Web Content | Accept cookies from sites>); - Delete all cookies for that account (<Settings | Privacy & Security | Web Content | Show Cookies>); - Delete all passwords for that account from saved passwords (<Settings | Privacy & Security | Passwords | Saved Passwords>); Next time you fetch or send email, you should be asked for your credentials, you'll be asked if you want to save them (Yes, of course) and they should be saved for subsequent sessions. I have to say that their on-line help pages are poor. Vague, incomplete information and many broken links.