

Because Mac OS X now hides all system files by default, you have to know EXACTLY where to look. Now we have to find the placeholder email signature you created in step 1.If you need a bit of help, the HubSpot Email Signature Template Generator is free, easy to use and produces nice looking email signatures. The HTML should not include a HTML or head tag and should only use inline CSS and basic HTML elements. You can write your own HTML code if you know the ins and outs of HTML email signatures. Now you need to create an HTML signature.Close the Preferences window and quite Apple Mail.You can also highlight the email account you want to use and then select the new placeholder signature from the Choose Signature menu at the bottom of the window. Ensure that the new signature is associated with the email account you want to use it with by dragging it’s name from the middle colour to the email account in the account list on the left.Insert placeholder text, this is only needed to ensure you are editing the right signature file in a later step. Go to Preferences > Signatures and click on the + icon to create a new signature. In Apple Mail we need to create a new placeholder signature that we will be replacing with our new, fancy HTML signature.

He has specific instructions for Lion, Mountain Lion, Mavericks or Yosemite, El Capitan as well. If my simplified instructions don’t work for you I highly recommend giving Matt’s more detailed instructions a try.

These instructions were inspired by Matt Coneybeare’s awesome instructions, but I’ve take a little different route that is much simpler. These instructions apply to Mac OS X 10.12 (Sierra) but they should also work for older versions of Mac OS X as well. Thankfully, after creating my own HTML signature, and installing a handful for clients, I’ve figured out a simple way to get the job done. For some bizarre reason using an HTML signature is a shockingly difficult proposition. Unless you want to have a fancy HTML email signature and are using Apple Mail that is. Mac OS X has a reputation for being user friendly, and in almost every single way it is.
