Email Signature for Apple Mail

Apple Mail on Mac supports HTML signatures, but only if you add them correctly. If you paste HTML code directly into the signature text box in Mail Preferences, it renders as raw code, not formatted HTML. The workaround is to create an HTML file, open it in Safari, select all, copy it, then paste into the Mail signature box. This copies the rendered HTML rather than the code. The full steps are in the Mac section below.

Not via Settings → Mail → Signature — that only supports plain text. The workaround is to use Gmail or Outlook's mobile app instead of the native iOS Mail app, since those apps pull the HTML signature from their respective web settings. Alternatively, some people set up their HTML signature in iCloud Mail via a web browser, which then syncs. But the native iOS Mail app itself does not render HTML signatures.

This is a setting in Apple Mail (Mail → Preferences → Fonts & Colors) that overrides the fonts in your signature with the font you've set for composing messages. If it's turned on and your compose font is something different from your signature font, your signature will look different from what you designed. Turn it off (go to Mail → Preferences → Fonts & Colors, and uncheck 'Use the same message font') to preserve your signature's original formatting.

In Mail on Mac: Mail → Preferences → Signatures. On the left is your list of email accounts. Click an account to see its signatures. You can create multiple signatures per account and set a default. To use a specific signature for each account, select the account in the left column, then drag a signature from the middle column to 'Choose Signature → [account name]'.

Yes, on Mac. Images in Apple Mail signatures are embedded directly in the email (as attachments), rather than hosted on a server. This means they always load, but they add to the file size of every email you send. For a typical 80×80px headshot, the overhead is small (20–60KB). For large banner images, it can be significant. On iOS, images in the plain-text signature area are not supported.

This happens because Apple Mail embeds images as attachments rather than inline. Some email clients on the receiving end show those embedded images as separate attachments. You can reduce this by hosting your images externally (on your own server or a CDN) and linking to them with an <img> src URL rather than embedding them directly. NeatStamp generates signatures with hosted image links, which avoids this issue.

Unfortunately, no — not for HTML signatures. Apple Mail signatures are stored locally on each device. If you add an HTML signature to Mail on your Mac, it doesn't automatically appear on your iPhone or iPad. You need to set up the signature separately on each device. On iOS, you're limited to plain text anyway, so many people maintain their HTML signature on Mac and use a simplified plain-text version on mobile.