1. Do not include display names in your address book. There is nothing you can do about display names included in the mail you receive.

2. No

Thank you to answer me,

How not to put the name and surname, because when I reply to an email, they are automatically? Indeed, people who send me emails, put themselves their names and surnames.

Kind regards.

You are free to edit the "display name" field in your Address Book.

There are add-ons that can tidy up outgoing messages to remove nicknames and suchlike.

There are add-ons that display only the allegedly real address. Some users prefer this for their incoming mail to check that messages are truly from who they say they are, but then you're left with the business of knowing all your contacts' addresses intimately.

But you said "without add-ons" so I guess we can't help you with these.

What did you mean by "responds in cc"? I know of an addon that lets you change the addressing between to/cc/bcc en bloc, but again you have summarily dismissed add-ons for this.

Hello and thank you for accepting to answer me.

- Without addons, this is just for the Bcc, because I already use an addons: Use Bcc instead. I just wanted to know, if by chance, there was a command line to do so permanently.

For Bcc, I was wrong with the French : Ccc (Copie carbone cachée).

- for the problem of the name and first name, I accept the addons, unless there is something in about:config.

Kind regards.

Outgoing: https://addons.mozilla.org/en-US/thunderbird/addon/auto-address-cleaner/?src=ss

Incoming: https://addons.mozilla.org/en-US/thunderbird/addon/show-address-only/

For Bcc (anglais) or Ccc (français) I can only suggest the Use Bcc add-on which you already know.

You can also set an automatic default Cc or Bcc in Account Settings:

Tools|Account Settings|Copies & Folders

Thank you very much for your information

For the Bcc, it is only that I send systematically all my messages in this way, even for one person. In fact, it is in the address bar that I do not want to land appear name and surname.

It was explained to me that this increased security to prevent spammers robots.

Sorry for my English, but this is not my language.

Best Regards

Maleficent said

It was explained to me that this increased security to prevent spammers robots.

Not so. It makes it harder when there is a mailing list to determine who is being mailed and harvest the email addresses from the list, but only for those who receive the email. For individual emails is is a waste of effort.