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

blind copy addresses showing in sent emails and when reply all goes to all addresses

  • 2 replies
  • 1 has this problem
  • 3 views
  • Last reply by sparky21

more options

i have found out recently that when i send out messages as blind copy my recipients can see some of the blind copy addresses but not all. even worse when they click on reply all it goes to all that were blind copied. this is dangerous!

i have found out recently that when i send out messages as blind copy my recipients can see some of the blind copy addresses but not all. even worse when they click on reply all it goes to all that were blind copied. this is dangerous!

All Replies (2)

more options

re : my recipients can see some of the blind copy addresses but not all. This is most likely down to something the server is doing or not doing. Q: What server are you using to send emails? gmail, yahoo, comcast etc Q: Those recipients that are seeing some bcc'd email address, are they all on the same server. eg: the latter part of email address is the same or they all go through a particular server eg: outlook

re : when they click on 'reply all' it goes to all that were blind copied. Are they all using Thunderbird email client? After clicking on 'Reply-all', can they see all the individual email addresses before they send?

more options

the recipient who told me about it is using gmail. When she clicked on reply all it showed two of the blind copied addresses but sent it to another, that had not been displayed but was in the blind copy, as well as the ones displayed. I am using sky email which uses yahoo. if i go to the sky website to log into my emails i can send blind copies there and when they arrive reply all is not an option