Is there a way to edit the subject line of emails you've received in Thunderbird? I use email a lot for work and it would be a lot easier if I could change subjects to make things easier to find later.

I found a plug-in but it only works for Thunderbird up to 2.0 and I'd rather not have to downgrade to get this feature.

  • 5
    I hate that most of my colleagues send blank-subject emails 99% of the time.
    – Draemon
    Feb 19, 2010 at 20:46

4 Answers 4


Move the message to Drafts, edit Subject, move message back.

  • 2
    that replaced the original sender with oneself and updates the message date though... Nov 15, 2011 at 12:50
  • Technically this works, but it alters other things in the email to such as the sender, so isn't an option.
    – NickG
    Oct 31, 2013 at 13:37

The Edit Email Subject extension does this (but it won't sync IMAP)

  • 1
    Yes, it will sync IMAP, as of New Year's. There's a configuration option. You have to enable it.
    – colan
    Apr 15, 2012 at 22:51

TB Header Tools Extension (add-on)

this thunderbird add-on lets you change any header or the email's source. I use it with TB 3.1.9 to add subjects to those awful blank-subject emails ...

For a description/discussion of this add-on see:


Note: if you are using TB 3.1.x, make sure you get the patched version. The unpatched add-on will install, but won't show the edit dialog.

  • Dead link I'm afraid.
    – NickG
    Oct 31, 2013 at 13:38
  • Try this one
    – Tom Hale
    Aug 28, 2017 at 13:33

I use Thunderbird to connect to my Gmail account (via IMAPS); but for gritty email stuff, I use 'Mutt'; also via IMAPS. It's text based, (which takes a little getting used to initially), but extremely powerful. If you really need something graphical, than the 'Edit Email Subject' Thunderbird plug-in already mentioned is probably your best bet.

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