How to Add Your Signature to Thunderbird

Set up your email signature in Mozilla Thunderbird

Mozilla Thunderbird

Go to Tools → Account Settings

Or right-click on your email account in the folder pane and select "Settings"

In the left panel, click on your email account name

Check the box for "Use HTML"

Important: This must be checked for formatted signatures to work properly

Click "Copy HTML" on your signature

In the "Signature text" box, paste your HTML signature

Thunderbird will render it properly when you compose emails

You can also save your signature as an HTML file:

Click "OK" to save your settings

Compose a new email to see your signature

Make sure "Use HTML" is checked in your account settings. Without this, Thunderbird will display the raw HTML code.

Thunderbird requires images to be hosted online. Ensure all image URLs start with https:// and are accessible.

Each email account in Thunderbird can have its own signature. Just repeat these steps for each account.

In Account Settings → Composition & Addressing, you can choose where to place your signature in replies and forwards.