How to make an email signature with multiple hyperlinks

I have been helping a company with their rebrand (business cards, portfolio etc), and have created an email signature in InDesign that I exported to an interactive PDF in order to retain the multiple hyperlinks that will take recipients to their websites and various social media sites. Can’t get the PDF to not be tiny once in the email signature, and hyperlinks don’t work with JPEGs so need some advice as to how to overcome this please!

Their team uses a mix of Macs and PCs but their email provider is all through Outlook