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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.

Create Yours
  • 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

How to setup an email signature in Postbox on Mac

Install your HTML email signature in no time! Use our signature installer or follow our step-by-step guides to install your email signature in Postbox for Mac.

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

Before you start

Before you start

Great news! We've officially released our new signature installer app for macOS. Simply download, install, and follow the guide to setup your signature in just minutes with our all-new automatic update functionality!

Try our Signature Installer App for Postbox

We've spent the past few months developing a brand new signature installer app for macOS which works with all of the major email clients including Postbox for Mac. By using the signature installer app, you will be able to easily install your email signature in the following email clients:

  • Apple Mail (El Capitan and newer)
  • Outlook for Mac 2016
  • Outlook for Mac 2011
  • Postbox
  • Thunderbird for Mac

Installing your email signature with our app takes just seconds. You simply select your email client and email account, then enter your unique signature key or insert your custom HTML code and the installer app will install your email signature into your desired email client for you.

Not only does the signature installer app install your email signature for you, it will also automatically update your email signature whenever any changes are made to your email signature from your account. This is only applicable if using your signature key.

Next Step

Click on our Install: Signature Installer App below to follow our written installation guide with screenshots.

If for whatever reason you don't want to use our Signature Installer App, you can still install your email signature manually by following our Install: Step-by-Step guide instead.

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

Install: Signature Installer App

Install: Signature Installer App

Before following the below instructions, you must have the ESR Signature Installer App installed. If you do not yet have it installed, you can download it from the Before you start section above.

Installing your email signature in the signature installer app

Step One

Open the ESR Signature Installer app and click the Add New Email Signature button.

Step Two

Select your Postbox email client.

Step Three

Select the email account you want your email signature to be installed for.

Step Four

Paste your email signature key and click Save Key. If you have HTML code instead of a key, click Advanced Settings, paste in your HTML code and click Save.

Step Five

Once you click Save Key, your email signature will be installed within Postbox for Mac. Simply compose a new email and your signature will automatically be inserted!

compose new email in postbox

It's as easy as that!

Install: Manual Step-by-Step Guide

Install: Manual Step-by-Step Guide

IMPORTANT: Do NOT use Safari during the installation process as it may cause formatting issues. Copy your email signature from Google Chrome or Mozilla Firefox instead.

Step One

Open Postbox for Mac.

Step Two

From the top menu, select Postbox then Preferences...

select postbox then preferences

Step Three

From the Preferences window you will see several tabs across the top. Select Accounts then from the left side in Accounts, expand your mail account and select Identity.

select preferences, accounts, identity

Step Four

With your Identity settings open, select the Edit... button down next to Signature.

A new signature window will open up to paste your email signature but first we need to copy it.

Step Five

Now we want to open our email signature. If you have had your email signature sent to you, simply open it in your web browser. If you have logins to your Email Signature Rescue account, select Full Screen Preview on your signature from your dashboard.

Now that you've opened your email signature, press Command + A to select all, then Command + C to copy the email signature.

View signature in browser or full screen preview
highlight and copy your email signature

Step Six

With your email signature copied, switch back to Postbox for Mac, click into your signature window and press Command + V to paste.

switch to postbox and paste your signature

Step Seven

Now that your signature has been pasted into your settings, all you have to do is close out of preferences and start emailing! Compose a new email and you'll see your email signature inserted each time you send an email from that account.

NOTE: When you paste your email signature and start composing a new email, you will see the table/cell outlines. Ignore this as it won't display when your signature is actually sent.

close preferences and compose a new email

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 images are stacked under one another instead of side-by-side

This issue occurs when copying your email signature from Safari. If you're experiencing this, you will need to open your email signature's HTML file in Google Chrome or Mozilla Firefox (or be logged into your Email Signature Rescue account using Chrome or Firefox if copying from Fullscreen Preview) then copy the signature from there.

My email signature doesn't look right when I paste it or send an email

More than likely, you have used your mouse to highlight the html email signature file in the browser. Don't use your mouse, only use Cmd + A (hold the Cmd key and press A at the same time) to select all of your email signature. If you use your mouse, you may miss out on some of the vital code needed to make your signature work correctly.

Another cause to this could be that you've used Safari to copy your email signature from and not Google Chrome or Mozilla Firefox. Using Safari will cause formatting issues. To resolve this, install Google Chrome or Mozilla Firefox from our Before You Start screen and copy your signature from one of these browsers instead.

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

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.