Falsehoods programmers believe about email signatures (or: bad lessons in sleep hygiene)

TL:DR; for this post: Writing DIY Email signatures in HTML is still a mess in 2025. Use a service like Exclaimer, Crossware or CodeTwo if you can, otherwise approach them as if you were writing a mail newsletter using a framework like MJML or Foundation. The best email client for debugging them is AirMail. Caveats […] The post Falsehoods programmers believe about email signatures (or: bad lessons…