Beautifully designed HTML Signatures
for almost any email client.

We make creating, managing, deploying and installing HTML email signatures for you and your staff incredibly easy. Create and install today. No technical help required.

Create Yours

Install your signatures in more software than any other email signature provider. We support 60+ email clients and apps. Find Yours

email signature rescue
Over 100,000 email signatures created with Email Signature Rescue
  • logo century21
  • logo culturetrip
  • logo dudeperfect
  • logo experiencekissimmee
  • logo kw
  • logo mcafee
  • logo remax
  • logo seattleu
  • logo ucdavis
  • logo umg

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

Install your HTML email signature in Thunderbird on MacOS no time! This article includes a link to our free Thunderbird on MacOS email signature installer app, 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 Mozilla Thunderbird for Mac. Check out our beautiful email signature templates and easy to manage email signature software, that makes creating email signatures for Mozilla Thunderbird for Mac a breeze.

Before you start

Before you start

Before you start:

  • Make sure you have your html email signature file or email signature key accessible.
  • Open Mozilla Thunderbird.

Which installation option should I choose?

Signature Installer App for macOS (Recommended)

If you have a unique signature key then you will want to install your email signature via our installer app. The installation is simple and means you won't have to manually install the signature yourself.

The bonus of using the signature installer app is that it features auto-update functionality and will automatically update your signature in your email client whenever changes are made to it via Email Signature Rescue, preventing the need to re-install.

*Please note that our Signature Installer App is still in beta so we are working on improving it. If you experience any issues, please provide us with detailed feedback via this form.

Basic Guide

If you have a html signature file then you may be able to follow the Basic Guide.

The Basic Guide is a simple installation which involves simply pointing to the location of your email signature file.

If you run into any issues during your HTML email signature installation in Mozilla Thunderbird, please see the Troubleshooting FAQ before contacting support through your member account.

Install: Signature Installer App

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 macOS 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 macOS


1
Step One

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


2
Step Two

Select your email client.


3
Step Three

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


4
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.


5
Step Five

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


6
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 macOS Installer App here or via the app.

Install: Basic Guide

Install: Basic Guide

1
Step One

Open Mozilla Thunderbird for Mac.


2
Step Two

From the top menu, select Tools then Account Settings.

select tools then account settings

3
Step Three

From the Account Settings window you will see a list on the left side with your mail accounts and some settings, select your email account.

Under your Default Identity section you will see your signature setting. Tick the Attach a signature from a file instead (text, HTML, or image): checkbox then click the Choose... button.

tick the attach signature checkbox

4
Step Four

Now we want to navigate to our email signature file and select it. If you have had your email signature sent to you, access it from your email, save it to a location on your computer, then select it from your Thunderbird account settings.

navigate to and select email signature

5
Step Five

Press OK to save your account settings, then compose a new email.

Your email signature will automatically be inserted into your emails when composing a new email.

NOTE: Your email signature will show the table and cells when composing a new email. These won't show once the email has been sent.

compose a new email within Thunderbird

All Finished!

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

Troubleshooting: FAQ

Troubleshooting: FAQ

If you're experiencing any issues installing your email signature within Postbox for Mac, you'll likely be able to find a resolution here.


I'm experiencing issues with the ESR Signature Installer App

Although we've thoroughly tested it, the ESR Signature Installer App is still in BETA so it's possible that you may experience some issues. If you do come across any issues when using the app, please get in touch with our friendly support team.


My email signature doesn't look right when I compose an email

When composing an email within Mozilla Thunderbird for Mac you will see the table and cells of your email signature outlined, this is completely normal. When you send your email, it will display correctly to your recipient.


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.


Still experiencing issues?

If you're a member of Email Signature Rescue, you can submit a ticket to our friendly support team through your member account using the red help button. If you're not a member and need help creating or installing your HTML email signature, consider joining Email Signature Rescue for assistance.

Troubleshooting: Where do I find my email signature key?

Troubleshooting: Where do I find my email signature key?

  • If you are an Email Signature Rescue member and are logged into your account, you can find your key on your dashboard.
  • If you have been emailed your signature key, go to the email and you'll find your 12 character key there.
  • If your email signature is managed by an account administrator or reseller, please get in touch with them and have them supply you with your signature key.

Troubleshooting: Where do I find my email signature HTML file?

Troubleshooting: Where do I find my email signature HTML file?

  • If you are an Email Signature Rescue member and are logged into your account, you can download your HTML file from your dashboard or view it by selecting Full Screen Preview.
  • If you have been emailed your signature file, open the email and you'll find it attached.
  • If your email signature is managed by an account administrator or reseller, please get in touch with them and have them supply you with your signature file.

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

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

If you don't have an email signature key or HTML file, consider joining Email Signature Rescue now and get creating! We offer over 30 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

Over 100,000 email signatures created with Email Signature Rescue
  • logo century21
  • logo culturetrip
  • logo dudeperfect
  • logo experiencekissimmee
  • logo kw
  • logo mcafee
  • logo remax
  • logo seattleu
  • logo ucdavis
  • logo umg

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.

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

Email Signature Software for Businesses and Designers.