I have friends who don’t want their name to show when I send a group email. How do I mask the names of the people I am sending emails to on Firefox?
did you mean Thunderbird?
Anyways, it doesn't matter which client or account you are using. To hide people's eMail address for the recipients, you just add their eMail addresses in the BCC field, rather than the To field.
BCC means they receive a 'blind copy' (in old times 'blind carbon copy') of the eMail, but all other recipients won't know about it. When you add them to CC, however, all recipients will see that they received a copy of that same eMail.
Please let me know whether that makes any sense or if you need more help. Thank you!