Email Signature Alt Text

Alt text in an email signature is the descriptive text attached to each `<img>` element via the `alt` attribute. Alt text serves three functions: screen readers announce it instead of the image to blind and low-vision users; email clients display it when the image fails to load (blocked by Gmail's image protection, missing CDN, slow cellular connection); and search and AI tools use it to understand image content. Good alt text is concise (under 100 characters typically), descriptive of the image's function rather than its appearance ('SyncSignature logo' is better than 'green and white logo image'), and includes meaningful identifiers (company name in the logo alt, person's name in the photo alt). Logos use the brand name as alt text. Profile photos use the employee's name. Banner campaigns use the campaign message ('Q4 Webinar: How to scale to 100 customers'). Social media icons should not use generic alt text like 'icon'; they should name the platform ('LinkedIn'). An empty `alt=""` is appropriate only for purely decorative images that add no content.