Mac Mail HTML Signature Fix

My HTML email signature is already built with a logo, social-media icons and full contact details, and it works everywhere except Apple Mail on macOS—images refuse to load there. I need someone who understands the quirks of Mac Mail’s WebKit engine and the way it rewrites HTML... (Budget: $15 - $25 CAD, Jobs: CSS, Email Marketing, HTML, JavaScript, PHP, Web Design, Web Development)