Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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

BCC suddenly returned undeliverable- even to my own single email account

  • 2 àwọn èsì
  • 0 ní àwọn ìṣòro yìí
  • 24 views
  • Èsì tí ó kẹ́hìn lọ́wọ́ annk2021

more options

Periodically my BCC function suddenly quits working in Thunderbird. This morning it has totally failed and I cannot BCC to my own email in a single test email. Yesterday it was working great and has usually worked great. A couple of months ago I had this same failure and after some hours had passed, and it suddenly began working well again. This is the error message for today for all BCC: Delivery has failed to these recipients or groups: annfriday2021@outlook.com Your message wasn't delivered because the recipient's email provider rejected it. Update: I tested it just now and it will BCC to all of my TB mail groups except for one group which I have not had problems with in the past. However, an hour ago the BCC was not working for any of my TB mail groups, nor for a single BCC test email to myself. Thanks

Periodically my BCC function suddenly quits working in Thunderbird. This morning it has totally failed and I cannot BCC to my own email in a single test email. Yesterday it was working great and has usually worked great. A couple of months ago I had this same failure and after some hours had passed, and it suddenly began working well again. This is the error message for today for all BCC: Delivery has failed to these recipients or groups: annfriday2021@outlook.com Your message wasn't delivered because the recipient's email provider rejected it. Update: I tested it just now and it will BCC to all of my TB mail groups except for one group which I have not had problems with in the past. However, an hour ago the BCC was not working for any of my TB mail groups, nor for a single BCC test email to myself. Thanks

All Replies (2)

more options

I suggest you ask the folk at Microsoft why their outlook.com email server rejects your BCC mail. I could only begin to guess.

Helpful?

more options

Thanks Matt, Micro 365 is impossible for me to find a support phone number but I did take your suggestion and emailed them a description of the problem. I tried a new test email this morning from the Outlook server and it worked for a small group BCC email. Sounds like you believe it is a problem on their end. I am not happy with Micro 365 which is why I use TB and find it to be vastly more user friendly. Thanks

Helpful?

Béèrè ìbéèrè

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.