You can download the SPARK application here : https://sparkmailapp.com/download
Set up your mailbox(es)
To set up your signature, simply go to the Settings menu:

Select the "Signatures" tab:

Click on : + ADD A SIGNATURE
Go to the HTML section

In your user interface, in the "Mail signature" section, select and copy the "HTML code" displayed below the signature:


In Spark, click on the "HTML" button and paste your code:

That's it, your signature is set, and will be automatically updated when you make any future changes.

**When you exit "HTML" mode, you can also add text to your signature.
Now you can test your signature by sending yourself an email BUT BE CAREFUL, the link in your signature is NEVER active when the email is sent, only when it is received.