Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

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

thunderbird mail

  • 1 reply
  • 1 has this problem
  • 10 views
  • Last reply by david

more options

As of yesterday i can no longer send emails out using BCC. I have even installed a older of thunderbird without success.. now error message I get is An error occurred while sending mail. The mail server responded: 6.6.0 Error sending message for delivery.. Please check the message and try again. I installed oe classic and use verizon as my internet. aol site works fine but thunderbird has issues...help ray g

As of yesterday i can no longer send emails out using BCC. I have even installed a older of thunderbird without success.. now error message I get is An error occurred while sending mail. The mail server responded: 6.6.0 Error sending message for delivery.. Please check the message and try again. I installed oe classic and use verizon as my internet. aol site works fine but thunderbird has issues...help ray g

All Replies (1)

more options

Set TO to your own email id. TB doesn't like sending BCC alone.