This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Thunderbird BCC

murrayhess
murrayhess
more options

Thunderbird sends email and CC: very well, just recently it will not send Bcc: of the same email.

I continue to receive this message: Sending of the message failed. The message could not be sent using Outgoing server (SMTP) smtp.mail.yahoo.com for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.

Thunderbird sends email and CC: very well, just recently it will not send Bcc: of the same email. I continue to receive this message: Sending of the message failed. The message could not be sent using Outgoing server (SMTP) smtp.mail.yahoo.com for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again.

All Replies (1)

Display name. день сумо
Display name. день сумо
more options

Hello there murrayhess We have read your message We try to help you.

Check in settings if your Smtp server for outgoing e-mail traffic is the same as Recommended.


https://support.mozilla.org/en-US/kb/manual-account-configuration

https://support.mozilla.org/en-US/kb/cannot-send-messages


Check your Smtp setting for outgoing emails.



Greetings Firefox volunteer

Modified by Display name. день сумо