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    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

    Search for your answer here

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    Professional email signature
    software & templates

    Create your new HTML email signatures online using our Email Signature Rescue software and email signature templates.

    Professionally designed, coded and tested templates

    We've done all the hard work, now the fun part of customizing your email signature templates is up to you. You can rest assured that your email signatures are going to look good in over 45 major email clients and apps too.

    20+ Templates, 1000's of design combinations

    You get 20 professionally designed, coded and tested HTML email signature templates, but there are literally 1000's of unique email signature template designs combinations you can achieve, when you customize the templates with our Email Signature Rescue software.

    Create and manage email signatures online

    From your Online Dashboard, create new, edit existing, delete, email, download and duplicate email signatures at any time. Use our Live Preview Signature Editor to create your email signature design on-screen. Customize your signatures text, labels, images, icons, fonts, colors, margin widths and more.

    Compatible with 45+ email clients and apps

    Install your new HTML email signature templates in any email client or app that supports HTML email signatures. See the full list here. All our our email signature templates have been tested across all supported email clients and apps too.

    Join over 70,000 users. We have plans and features to suit Designers & Agencies, Businesses & Companies and Small Teams & Solopreneurs.


    • If you have any doubts about this service, then don't! It is brilliant.

      Tom Skowyrski, IT10
    • Made creating a HTML signature a walk in the park.

      Catherine Nicholson, Fortunatus Housing Solutions
    • Email Signature Rescue will give you the best experience of anything on the market.

      Merritt Wiley, Staff Crafters, Inc.
    • Awesome product, so easy to use, looks good, modern and stylish.

      Andrew Nickolls, Kleen Group
    • Nothing comes close to the clean, modern styling that ESR has put together.

      Kyle Garrett, KTG Films
    • Gave me the tools I needed to create three wonderful signatures for our office.

      Carrie Nelson, Scott Friedman and Associates
    • I have never seen so many people notice my signature and compliment it.

      David Malka,
    • Let's me get on with client-facing business, rather than perfecting html programming.

      Gary Lawson, Gondwana LLP
    • Worth every penny, keep up the great work!

      - Nathan Jaffan
    • Thanks for making us look so professional.

      Alexandra Mosher, Alexandra Mosher Studio Jewellery
    • I use both Outlook 2013 and Gmail. Very easy and the finished product is incredible.

      Fred Smith, Life 4 Diabetes
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      Brenda Llamas Young, Encore Romance Travel
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      Michael Gay, MSG Architecture
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      Christine Neely, Christine Neely Photography
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      Tom Clawser, Delta Reliability
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      Dana George-Berberich, Writer
    • Just an excellent service.

      Bryan Houlihan, Seachoice
    • Best tool to customise effective html email signature.

      Yasmine Sakr, the farm | Branding and Creative Lab
    • This service is fantastic, and the small price negates any headaches of trying to do it manually.

      Adam Ryan Lawdor, Vanguard House
    • Thank you for making the set up of an html email signature simple and easy.

      Rikke Raahauge, Scandinavian Event Factory UAE
    • Worth every penny.

      Anthony Zak, Meissner Management
    • Would definitely recommend it to other small businesses.

      Ellen de Vries, OSCAR Natural
    • Made this work fun, plus portable to everyone in our organization running different email programs.

      Djuna Ivereigh, Jungle Run Productions
    • You absolutely have to try it. Completely customisable and an elegant solution.

      Lewis Daniels, Strategy Hand
    • Allows for multiple signature options for companies with various brands.

      Evert Botha, Embee Diamond Technologies Inc.
    • I was ecstatic to find all the features we needed and then some.

      Brian Harstine, Liquid Crystal Productions
    • Outstanding! Works well to keep businesses 'on brand' and looking their best.

      Kathy Sullivan, Six Degrees Studio
    • Having any of your email signature styles adds the professional look I was seeking.

      David Levin, David Levin Photography
    • I've tried out other email signature services and none was as nice or easy as Email Signature Rescue.

      Joe Cunha, Celorico Construction Inc
    • We have been very pleased with Email Signature Rescue. Makes everything easy and simple.

      Marcus Brown, Marcus Brown Properties
    • It's totally awesome and totally worth it.

      Scott Wasserman, Wasserman Inbound Marketing
    • Email Signature Rescue has by far been the best solution we have found.

      Marc Headley, Mode Systems