For years I have the following problem that I'd like to solve finally.

I have my own server with an email account, e.g. [email protected]. Then I have another identity (email address with another domain, but belonging to my server), let's say [email protected]

The Mozilla wiki Multiple identities per e-mail account says:

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.

Well, when I reply to an email that was sent to [email protected] Thunderbird always uses [email protected] as the sender. Always.

I tried a lot but could not find a solution until now, how frustrating!

  • 1
    Doesn't the Flexible Identity extension mentioned on the Mozilla wiki page help?
    – M K
    Sep 17, 2013 at 11:51
  • Did you setup the multiple identities under the same account or do you have multiple mail-accounts with its own identity?
    – Rik
    Sep 17, 2013 at 12:22
  • That's weird. Long ago it worked here. Now i tried it and it also failed to select the correct identity. Do you use IMAP or POP. (I now use IMAP.) If i copy a couple of mails to the "Local Folders" and reply from there it does work.
    – Rik
    Sep 17, 2013 at 13:13
  • thx 4 ur feedback. / Flexible Identity plugin says it is analysing the recipient not the receiver email. / I have one mail account with 2 identities. / I am using POP on port 995 (SSL/TLS). / I am surprised, within the Local Folder it works, problem is I don't use the Local Folder. So maybe we have a bug here?
    – Avatar
    Sep 17, 2013 at 13:20
  • I don't know what changed (maybe the new Thunderbird 24.0) but for me it is working again (also with my IMAP-account). When replying a mail send to our info@ address i get the correct identity in the From field.
    – Rik
    Oct 10, 2013 at 12:15

4 Answers 4


The add-on folder-account (suggested by Matheretter) helped for me too.

Enabling and disabling this add-on I figured out that the problem of the wrong identity when replying occurs when:

If a message is sent to [email protected] it is forwarded to [email protected] and TB by message filter puts it into an inbox-folder for [email protected].

Without the folder-account add-on OR with the add-on, but with "use Default" in the folder properties "from-account"-setting:

With the folder-account add-on enabled AND in the folder properties the "from-account" setting set to [email protected]:


After years I finally found a solution! Here you go:

  1. Install https://addons.mozilla.org/en-US/thunderbird/addon/folder-account/
  2. Create folders for each identity
  3. Create filters to move incoming emails to according folders
  4. Click on properties of each folder, you will see some additional options (due to the addon installed)
  5. There you specify the From Account: for each folder.

One longtime headache and time waster removed from my life ;)


There is possibility, that te @work address is used, because there is no sending account @home (but there is inbox for @home).


To solve this problem I created the extension cusedar (Homepage),
which is basically a merge of Flexible Identity and Reply as Original Recipient with some new features added.

It supports the outgoing direction (select from-address based on recipient) and incoming/reply direction (reply to a received mail uses again the same from-address).

  • I can't seem to find the addon in Thunderbird 60.7.0 :(
    – Raphael
    Jun 11, 2019 at 18:17
  • I guess it's hidden from search because review by Mozilla is still outstanding. If you want to give it a try nevertheless, use the direct link or head over to the homepage instead.
    – sd2k9
    Jul 6, 2019 at 20:12

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