Email Signature for Apple Mail

An email signature for Apple Mail is configured per-user in Mail > Settings > Signatures, where the user creates one or more signatures and assigns them per email account. Apple Mail supports rich-text signatures with images, formatting, and links, though it does not support the full HTML and CSS spectrum available in web email clients. For organizations managing macOS devices, signatures can be deployed via configuration profiles using mobile device management (Jamf, Kandji, Mosyle, Intune for Mac), which write the signature to the Mail preferences plist on each managed device. Apple Mail signatures are stored locally per Mac, so users with multiple Macs must configure each device unless server-side stamping is used. Apple Mail signatures do not automatically sync to Mail on iOS; the iOS Mail app uses its own per-device signature setting unless central management bridges them. For organizations using Microsoft 365 or Google Workspace mailboxes with Apple Mail clients, server-side stamping (Exchange transport rule or Google Workspace routing rule) is the most reliable way to ensure signature consistency.