(For help with multiple servers, see Advanced tips, below.)Īlso, click "Tools -> Account Settings -> Server Settings -> Advanced -> SMTP" and verify the correct SMTP server is selected there.Your provider should provide you with that information, if not, ask them. If it supports or requires encrypted connections, choose the right method here. Use secure connection: Unless your service provider supports encrypted connections (SSL or TLS) for outgoing mail, select "No". Also, your username (if needed) might be your full e-mail address (e.g., or only the part before the ("johndoe"), depending on your service provider check with them which is correct. If you receive error messages when trying to send, try unchecking this box. Use name and password: Check this box if your e-mail service provider supports or requires SMTP authentication.If you're having problems, ask them which ports they support for SMTP or outgoing e-mail. Port: Some service providers use non-standard ports (25 is standard).Verify the settings in Thunderbird exactly match what your ISP provides: no typos (e.g., "smpt"), extra spaces, punctuation mistakes (e.g., no commas instead of periods) or capitalization errors (e.g., lowercase instead of Caps).Ĭlick "Tools -> Account Settings -> Outgoing Server (SMTP)" (at the bottom of the left pane-you may need to scroll down), and double-check: That will give you a chance to clear the captcha if one exists.įirst, get the correct outgoing mail (SMTP) settings from your service provider, usually your Internet Service Provider (ISP): try their website, search Google for your ISP plus the word "smtp", or call them. Try logging into webmail using a browser. Thunderbird doesn't know about captchas, or have any way to clear them. Your email provider may set a captcha if they think you did something suspicious. If you send a message while in offline mode, it goes to the Unsent Messages folder in Local Folders. Verify Thunderbird is in online mode, not offline mode: click "File -> Offline" "Work Offline" should be unchecked. If your e-mail system has been stable and working for a long time, then suddenly doesn't send, suspect your ISP. The ISP antispam/virus software thinks it is a spammer attachment, and your outgoing mail disappears forever. One example of an item being blocked is the word 'geocities' - not in your mail but in your signature attachment. If that sends OK, then the problem could be this. Test for this by using your browser and logging into your ISPs webmail system (if they have one) and send an e-mail using the webmail. If you have any suspicious objects in your mail, the e-mail will leave your machine fine, but won't even reach their mail-server. In 20, some ISPs introduced new mail filtering before it reaches their mail-server. If you recently upgraded Thunderbird, verify that the firewall is not blocking the new version. Please check the antivirus settings again. If you are migrating from a previous email client, your previous email client might be able to send out email even with port 25 blocked by anti virus software. Some antivirus software (Network Assoc Viruscan) blocks port 25 to prevent mass emailing worms from sending out email. If your anti-virus program is scanning outgoing messages disable that feature (its okay to have it scan incoming messages). Sometimes those settings work fine with fetching mail but not sending mail. However, many firewalls/security suites have threat level settings. With a classic firewall its simply a question of whether or not you have a rule that states the application is allowed to connect to the Internet, and does the rule know about the current version of the Thunderbird executable. Verify that your firewall or antivirus program is not blocking Thunderbird. If Thunderbird displays an error message when you try to send mail, you can identify possible causes by looking for the message in the article: Connection errors - SMTP Firewalls and antivirus software 3.3 Transaction failed : Cannot send message due to possible abuse.
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