Email signature – Apple Mail (expert mode, CLI)

||| Apple has very recently blocked the display of images loaded from an external server in its Mail app. Our team is hard at work on a dedicated solution.



  1. Copy the HTML code for your email signature from your CARD.PM user account by selecting the blue text, right-clicking and choosing ‘Copy’.





  2. Once you’ve copied your HTML file, open the MAIL app on your computer, go to PREFERENCES > SIGNATURES and click the ‘+’ icon next to the email account of your choice (if you have more than one).

    At this point, either some ‘automatic’ text will be inserted into the signature automatically, or you can type in a short message such as ‘test’, for example.



    Next, exit Preferences and then close the Apple Mail app.

  3. Edit the .mailsignature file

    For your information, this file is created automatically when you add a signature in Mail’s preferences (step 2 of this tutorial), and it is this file that you’ll need to edit to customise your email signature with the CARD.P signature.

    To do this, you need to go to your Mac’s desktop:

    Keep the header in green and edit the code in red with your own HTML

    3.1. Open Finder

    3.2. Click the ‘Go’ tab and, at the same time, press the ALT / OPTION key



    3.3. This will bring up the hidden ‘Library’ tab. Make sure you keep the Option key held down to display this menu.


    Or, alternative method:

    In the Finder, select Go > Go to Folder.

  • In the Go to Folder dialogue box, enter: ~/Library

    Click Go.



    3.4. Click MAIL > V8 (or another number) > MAILDATA > SIGNATURE

    3.5. Next, you’ll need to find the most recently created file, which will be in the format 1XC1D786-D938-3GZ9-FO29-2F02T7J8SL14.mailsignature (check the creation date and time)



    3.6. Open the .mailsignature file in your text editor: here, you’ll need to keep the header (green box) and replace the body (in red) with the HTML code generated in step 1 (red box in the screenshot below)

    The green section should be kept, whilst the red section should be replaced with the HTML code for your signature (copied in step 1)





    3.7. Don’t forget to save your changes!

    Before reopening the Mail app, you must lock the .mailsignature file by right-clicking on it > then click on ‘View Properties’ and tick the ‘Locked’ box





  1. Check the result of your professional email signature

    Now, open the Apple Mail app and compose a test email by selecting your signature.