Relevant Product: Exclaimer Cloud - Signatures for Office 365
However, once a signature has been deployed to Outlook using the client-side rule, the hyperlinks are missing once the email is received.
Unfortunately, Outlook does not support image area mapping for content composed within the body of the message in Outlook.
This is the method by which hyperlinks are required to be added to objects rendered as bitmaps which, subsequently, is used to apply custom fonts to signatures.
However, you can use custom fonts via the Font Stack method.
If you are using a background image, you may substitute this as a banner image or use a background colour and split the image into different parts as a suitable workaround.