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Email Signature Software
for your small business

An average employee or business owner sends around 10,000 emails every year! Make every email you send count. Brand every email with your own custom HTML email signature.

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  • The service your website provides is exactly what we were looking for and has been easy to use all around!
    - Chad Terrell, Dude Perfect

  • Great for business and easy to use. I have all my social media links and icons and website link to the signature. Easy to create and add to our emails.
    - Gabriel Tubella, Pretium Homes

  • I get comments on how great my email signature looks and I love knowing it looks that great for everyone who opens an email from my business. Thanks email signature rescue!
    - Loren Waller, The Food Werewolf

  • Email Signature Rescue was exactly what we needed to create multiple email signatures that look good and are easy to create and update. Would definitely recommend it to other small businesses.
    - Ellen De Vries, OSCAR Natural

  • We love our signatures. We have had many different signature solutions over the years and Email Signature Rescue has by far been the best solution we have found.
    - Marc Headley, Mode Systems

  • What Email Signature Rescue has done to take the heavy lifting out of email signature design is stellar. Keep on doing what you're doing.
    - David Schmeikal, Rivitt

  • Love, love, love the new email signature that I created for our business! It looks so professional, and conveys all of the relevant links for our customers to connect with us. Beyond happy!
    - Tracy Jones, Premier Roofing Co.

  • So easy to use and the results are incredible. I have never seen so many people notice my signature and compliment it.
    - David Malka,

email signature rescue

Thunderbird on Windows PC: HTML Email Signature Installation Guide

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

You will need:

  • Your email signature file (.html file) downloaded and saved on your PC.
  • To have Mozilla Thunderbird open.

Next Step

If you are using an email signature HTML file created by our Email Signature Rescue software, click on Get Started: Windows 7/10 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: Windows 7/10 Signature Installer App

Install: Windows 7/10 Signature Installer App

IMPORTANT: The signature installer doesn't currently support Microsoft Exchange Mail accounts and may not find your email address in the list. Instead, you need to follow our Advanced Step-by-Step Guide below.

Email Signature Rescue members only: We now have a Windows 7/10 Installer App that will install your email signature in Mozilla Thunderbird, following our Step-by-Step Installation method in a jiffy!

Download Windows Installer App

Signature installer not working?
If you find that our signature installer doesn't recognize your account, don't stress! There are other simple ways to install your email signature. Select our Step-by-Step Guide or Video Guide below to have your email signature installed within minutes.

Install: Step-by-Step Guide

Install: Step-by-Step Guide

Step One

Login to your Email Signature Rescue account and download your email signature file. Save it to a location on your PC.

If you have been emailed your file, save it on your PC somewhere.

Step Two

Open Mozilla Thunderbird.

Step Four

Once Mozilla Thunderbird is open, press Alt to open up your top menu, then select Tools and Account Settings.

Select Tools then Account Settings

Step Five

A new window will open up with your account settings. From the left menu, select your mail 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 Six

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

save your changes

Step Seven

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!

Install: Video Guide

Install: Video Guide

Watch the video below for a full video guide on how to install your email signature in Mozilla Thunderbird on Windows.

Troubleshooting: FAQ

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

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 open the file in your web browser.
  • If you have your HTML file saved on your computer hard drive, navigate to where you have saved the HTML file and open with your web browser.

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

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 now

Email Signature Software

Use our online Email Signature Software to create, customize and manage all your HTML email signatures. Learn More

Email Signature Templates

Customize over 20 professionally designed, coded and tested HTML email signatures using our online software. Learn More

Install in 45+ Email Clients

Install email signatures manually or automatically in over 45 major email clients and software. Learn More

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

Over 80,000 email signatures created with Email Signature Rescue
  • Universal Music
  • Dude Perfect
  • Keller Williams
  • General Electric
  • University of Sydney
  • Remax
  • Century 21
  • Seattle University
  • UPS
  • Maps People
  • Auto Alert
  • The Collective
  • We Love to Travel
  • Amcal
  • Sales-Lentz Group
  • Oscar
  • Whites & Co
  • Apkudo

Email Signature Software for your small business.