Learn · email signature glossary
TL;DR
An email signature font is the typeface a signature is set in, and unlike on the web, the choice is confined to fonts already installed on the recipient's device. Email clients, with rare partial exceptions like Apple Mail, do not download web fonts, so a signature set in a custom brand typeface silently falls back to something else in most inboxes. The dependable set includes Arial, Helvetica, Verdana, Tahoma, Georgia, Times New Roman, Trebuchet MS, and Courier New, applied inline on each element with a fallback stack such as font-family: Arial, Helvetica, sans-serif.
Re: In practice
Font choice is where brand guidelines collide with email reality. A marketing team specifies its licensed brand typeface, someone builds it into the signature, and every recipient outside the company sees Times New Roman because that is the default fallback when a font is missing and no stack is declared. The fix is to accept the constraint: pick the system font closest to the brand face, declare a full fallback stack, and set the styling inline so it survives client processing. Keep body size at 12 to 14 pixels, avoid more than two font families in one signature, and never render text as an image to smuggle a brand font in, because image text scales badly, breaks in dark mode, and is invisible when images are blocked.
Fwd: Worth a look
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