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Thunderbird · 4 min read

How to add an HTML email signature in Thunderbird

Thunderbird supports full HTML signatures right in account settings. You can paste the HTML code directly, or load it from a saved file.

  1. 1

    Copy your signature code

    In DigiSignature, open your signature and choose the option to copy the HTML code.

  2. 2

    Open account settings

    In Thunderbird, click the menu (☰) → Account Settings, then select your email address on the left.

  3. 3

    Enable HTML

    In the Signature text section, check “Use HTML (e.g., <b>bold</b>)”.

  4. 4

    Paste the code

    Click into the signature box and paste the HTML code. Thunderbird renders it when you compose a message.

  5. 5

    Or attach from a file

    Prefer a file? Save the code as signature.html, check “Attach the signature from a file instead”, and choose that file.

  6. 6

    Test it

    Write a new message to yourself. If images don't show, allow remote content for that message or sender.

Good to know

  • Set the signature for each identity under Manage Identities if you send from more than one address.
  • Compose in HTML (not plain text) under Composition & Addressing, or the design will be stripped.
  • Hosted images keep messages light — DigiSignature hosts every logo and banner for you.

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