Example: - if i receive an email to mark@mark.com i would like that when i'm going to answer mark@mark.com automatically will be set as sender without my manual selection -if i receive an email to mark1@mark.com i would like that when i'm going to answer mark1@mark.com automatically will be set as sender without my manual selection -if i receive an email to mark2@mark.com i would like that when i'm going to answer mark2@mark.com automatically will be set as sender without my manual selection

Is it possible?

UPDATE : PLEASE NOTE - Yes, but perhaps not if you only have one mail account for mark@mark.com and all the other email address are set up as 'identities' to that main mail account and the relevant preference is not set to check all identities. https://support.mozilla.org/en-US/kb/using-identities

Thunderbird will use the default account if it cannot detect other identities - please read other comments regarding setting a preference to force the check on other identities.

Thunderbird will auto insert a 'From' email address and this depends upon what is set as the default identity for that mail account.

ALTERNATIVE: However, if you had three separate mail accounts, one for each of these email addresses: mark@mark.com; mark1@mark.com; mark2@mark.com ,then received emails would be placed in the respective mail account folders.

If you are viewing folders and emails in the eg: mark1@mark.com mail account when you click on 'Write' or 'Reply' to an email sent to mark1@mark.com, then the default identity - there would only be the one - mark1@mark.com - will be auto put in the FROM field.

I'll check to see if there is any preference that can force the correct identity and respond as soon as possible.

When you write a new message, Thunderbird uses the default identity for the account you are working in. When you reply to a message, Thunderbird uses the identity that matches the address the message was originally sent to, if it can find a match in the account you are working in. Otherwise it uses the default identity.

Please try this:

• Menu app icon > Options > General
• scroll to the bottom and click on 'Config Editor' button
• In search type: self
• look for this line : mailnews.reply_to_self_check_all_ident
• If this is set to 'False', double click on that line to toggle the setting to 'True'
• Close 'about:config' window
• Restart Thunderbird.

In recent versions - I think since version 65 - 'mailnews.reply_to_self_check_all_ident' should automatically be set to 'True'.

The instructions I gave in previous comment to access 'Config Editor' were for Windows OS version 78*, so let me know if you are using a different OS and/or different version of Thunderbird.

As a test I've just added a new identity, info@domain, to a mail account mail@domain and sent myself an email to using that additional identity. It was received into the main account mail@domain as expected, but when I attempt to Reply, it is entering the new identity into the FROM . the FROM field is displaying like this example: Name <info@domain> mail@domain

wow!!!!!! Solved!!!!! Thank you very much!!

wow!!!!!! Solved!!!!! Thank you very much!!

Your welcome :)