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September 29, 2014
Mac Mail Signature Installation
How to

Did you just purchase an email signature with Array, and now you are finding yourself with some HTML files and no clue how to install them? Never fear! Here are install instructions for Mac Mail Email Signatures. These instructions apply to anyone attempting to install a pre-built HTML signature in Mac Mail.

Step 1: Download the email signature files to your computer and unzip if necessary.
Step 2: Open Mac Mail, and go to Mail -> Preferences:

Step 3: In the pop up window, click the “Signatures” tab. In the left column, click the Mail account you are installing the signature for (Mine was Google). Click the [+] button at the bottom of the middle column to add a new signature. Give it a fun name.

Step 4: Where we install your signature file from this point depends on whether or not you are using iCloud for your email. If you are, you can skip to step 6a. If you aren’t, skip to step 6b. If you don’t know, continue to step 5.

Step 5: Return to your desktop and go to the Apple Menu -> System Preferences.

Choose “iCloud” from your panel. In the window that pops up, check to see if “Mail” has a checkmark beside it.

If it does, continue to step 6a. If it doesn’t, continue to step 6b.

Step 6: A) Are you Using iCloud? If so, your email signature install folder can be found at: /Library/Mobile Documents/com~apple~mail/Data/MailData/Signatures/. Open this folder from the “Go” menu by holding down the “Option” key to show the Library.
B) If you aren’t using iCloud or you can’t find the folder indicated above, your email signature install folder can be found at /Library/Mail/V2/MailData/Signatures/. Open this folder from the “Go” menu by holding down the “Option” key to show the Library.

Step 7: When you created your signature in step 1, Mail automatically created a XXXXXXX.mailsignature file that represents it in this folder. Locate the .mailsignature file in the ~/Library folder. It will have a random name. If it is not there, you may still be in “edit” mode on the signature. Try closing the Mail > Preferences Window. If you need help, it helps to sort the folder by “Date Modified” and look for the most recently updated one. Here’s what mine looked like:

Step 8: Right click the file. Choose “Open With” and then “Other.”

Scroll down and choose “TextEdit”.

Step 9: Go to the text edit menu bar and choose “Preferences”.

Click the “Open and Save” tab and check off the box labelled “Display HTML files as HTML code instead of formatted text” then close the Preferences box.

Step 10: Open finder and navigate to where you have downloaded and unzipped your email signature .html files. Right click the file and choose “Open With” and choose “TextEdit” similar to what we did above!

Step 11: Select all the HTML code (You can push CMD+A to highlight all) and copy it. (CMD+C).

Step 12: Go back to the window that has your .mailsignature file open. From the <body> tag down, select and replace it with your copied email signature. (CMD+V to paste).

And the pasted version:

Step 13: Save the file from the Menu “File” -> “Save” or by pushing (CMD+S).

Step 14: IF YOU ARE NOT USING iCLOUD (otherwise skip this step): You will need to lock this file so Mail doesn’t try to overwrite it back to your boring old plain signature. Go back to the Finder window where your signatures folder is to where .mailsignature file is showing. Click the signature and push (CMD+i) or right click the file and select “Get Info”. Check off the checkbox labelled “Locked”

Step 15: Close and re-open Mail. Go to compose a new mail. Your signature should appear!

Step 16: Crack a beverage. You’ve earned it.


  1. If you have followed these steps and something didn’t work, here are some possibilities that you might have made mistakes on:
    Did you select the right Email account in Step 3?
  2. Were you sure to lock the file in Step 14?