Super easy HTML
email signatures

Create your own beautiful custom HTML email signatures for over 60 email clients, apps and software including Gmail, Outlook, Apple Mail, iPhone/iPad Mail, Yahoo! Mail, and more.

Over 150,000 email signatures created with Email Signature Rescue
  • logo century21
  • logo collective-light
  • logo dudeperfect
  • logo experiencekissimmee
  • logo jll-light
  • logo kw
  • logo mcafee
  • logo remax
  • logo ucdavis
  • logo umg

How to setup your HTML email signature in Mozilla Thunderbird for Windows

Install your HTML email signature in Spark on Thunderbird on Windows in no time! This article includes a link to our easy HTML email signature installer app for Thunderbird on Windows, our easy step by step HTML email signature install guide, screenshots, videos and troubleshooting FAQ.

It's never been easier to create a new email signature for Thunderbird. Check out our beautiful email signature templates and easy to manage email signature software, that makes creating email signatures for Mozilla Thunderbird a breeze.

Before you start

Before you start:

  • Make sure your HTML email signature file downloaded and saved on your PC. It should be stored in a location which is easily accessible and will not be deleted.
  • Open Mozilla Thunderbird.

Next Step

If you have been provided created by our Email Signature Rescue software, click on Install: Signature Installer App for a quick and easy HTML email signature install into Mozilla Thunderbird.

If you run into any issues during your HTML email signature installation in Mozilla Thunderbird, please try our Step-by-Step Guide instead. If you continue to experience issues, please see the Troubleshooting FAQ for frequently asked questions, before contacting support through your member account.

Install: Signature Installer App

Installing your email signature via the app

Install your email signature once, then never worry again. Our signature installer app for Windows features auto-update functionality which syncs your email signature with our software, allowing it to automatically update when changes are made from your Email Signature Rescue account.

Download the Installer App for Windows

Step One

Open the Email Signature Rescue Installer app and click the ( + ) button to add a new signature.

Step Two

Select your email client.

Step Three

Select the email account you want to install your email signature into.

Step Four

Paste your email signature key. If you have HTML file instead of a key, click Use File, then click and select your saved HTML email signature file.

Step Five

Select to insert for replies/forwards if you would like, then click Install Signature.

Step Six

The app will install your email signature into your email client for you, and automatically update it if changes are made to it by the Email Signature Rescue account holder.

Installer app not working?

You can report an issue with our Windows Installer App here or via the app.

Install: Step-by-Step Guide

Watch the Video Guide

Rather watch how to install your email signature? Check out the video below for full step-by-step instructions on how to install your email signature in Mozilla Thunderbird.

Read the Step-by-Step Guide

Step One

Download or save your HTML email signature file in an easily accessible location on your computer. Make sure the file is saved somewhere that it won't be deleted.

Step Two

Open Mozilla Thunderbird and press alt to open up your toolbar, then select Tools and Account Settings.

Select Tools then Account Settings

Step Three

A new window will open up with your account settings. From the left menu, select your email account. At the bottom of your account settings you will see a signature text box. Tick the checkbox below that says Attach the signature from a file instead (text, HTML, or image): then click the Choose... button.

choose your email signature file to add it to your settings

Step Four

Navigate to your saved email signature file (.html) and hit OK to save your changes.

save your changes

Step Five

Compose a new email and your email signature will automatically be inserted.


That's it. Try your email signature now by composing an email to yourself or a friend!

Troubleshooting: FAQ

If you have tried our Step-by-Step Guide and Video Guide for installing your signature into Mozilla Thunderbird and you run into any issues, please read through this troubleshooting guide before contacting Support for further help.

My email signature has strange lines around it when composing an email

These lines are the table and cell outlines which Mozilla Thunderbird shows in composition mode. This is perfectly normal and is just displaying the table structure. When you send your email, your recipient won't see these lines and your signature will display correctly.

I am composing an email and I can't click on any links or social media icons

In compose mode, most email programs won't allow you to use the links in your email signature. Check to see if your email signature has been installed correctly by sending a test email to yourself instead. The links and social media icons should work when you receive the email.

Need more help?

Please contact our Member Support Team through your Email Signature Rescue account using the red help button for direct assistance.

Troubleshooting: Where do I find my email signature HTML file

Finding your email signature HTML file

  • If you are an Email Signature Rescue member and are logged into your account, you can download your HTML file directly from your Dashboard, by clicking on the Download button.
  • If you have been emailed your HTML file, go to the email and save the file to your computer.

Troubleshooting: I don't have an email signature HTML file

If you don't have an email signature HTML file, consider joining Email Signature Rescue now and get creating! We offer over 20 professionally designed and tested email signature templates, tools and features to create and manage your email signatures online and a whole lot more.

Join Email Signature Rescue

Everything you need to create, customize, manage and deploy HTML email signatures.

No Design Skills

No design skills required. Your signatures will look as beautiful as our examples. 20 easy to customize templates included.

No Tech Knowledge

Whether you’re a solo business owner, hairdresser, real estate agent or dog walker, anyone can create and install a signature!

Works With

Install in nearly all major email clients including Gmail, Apple Mail, Outlook, iOS and more. 50+ email clients, apps and software supported.

Reliable & Tested

We refine our HTML code and conduct extensive testing regularly to ensure it is industry-leading and works across all major email clients.

Save Time

Create, customize, edit, manage and deploy HTML email signatures from one central, easy to use system.

Save Money

No expensive IT staff, developers or designers needed. From signature design, to installation and support, we take care of it all.

Easy Duplication

10, 20, 30 or 100 staff? No worries! Duplicate signatures you’ve already created from the Dashboard to create multiple signatures quickly.

Support if you need it

Hit a snag? Help is only an email away. We're here for help with any design, installation and technical issues, should you need us.

Email Signature Software for Businesses and Designers.