Beautiful Email Signatures for Apple Mail

Apple Mail supports rich HTML signatures, but installing them requires navigating hidden folders and editing plist files. Siggly simplifies the process with a visual editor and step-by-step installation guides for macOS and iOS.

1B+

Active Apple devices worldwide

5 min

Signature installation time

100%

Retina-ready templates

How Siggly Helps Apple Mail Users

macOS Signature Installation

Siggly generates Apple Mail-compatible HTML and guides you through installing it in the correct Library/Mail signature folder on your Mac.

iOS Signature Support

While iOS limits signatures to plain text in the Settings app, Siggly provides workaround instructions for installing rich signatures via Mail.app profiles.

Apple-Optimized Templates

Our templates account for Apple Mail rendering quirks including WebKit-specific CSS, Retina image handling, and dark mode adaptation.

Dark Mode Compatible

Siggly signatures look great in Apple Mail dark mode. We handle background colors, text contrast, and image transparency automatically.

iCloud Sync Awareness

Understand how iCloud syncs signatures between devices and how to prevent Apple Mail from overwriting your custom HTML signature.

Installing a Signature in Apple Mail (macOS)

Create a Placeholder Signature

Open Apple Mail preferences, go to Signatures, and create a new blank signature. This generates the signature file Apple Mail expects.

Locate the Signature Folder

Navigate to ~/Library/Mail/V10/MailData/Signatures/ and find the .mailsignature file that matches your new placeholder.

Replace the HTML Content

Open the .mailsignature file in a text editor, replace the body content with the HTML generated by Siggly, and save the file.

Lock the File

Lock the .mailsignature file using Finder's Get Info panel to prevent Apple Mail from overwriting your custom HTML on next launch.

Apple Mail Signature Tips

Lock the .mailsignature file after editing to prevent overwrites

Use WebKit-compatible CSS for consistent macOS rendering

Include @2x images for crisp display on Retina screens

Test dark mode appearance — Apple Mail inverts some colors automatically

Disable iCloud signature sync if managing signatures manually

Frequently Asked Questions

Why does Apple Mail keep resetting my custom signature?

Apple Mail overwrites signature files on launch unless you lock the .mailsignature file. Use Finder's Get Info to check the Locked checkbox after making changes.

Can I use HTML signatures on iPhone?

iOS does not natively support HTML signatures through Settings. However, you can install a configuration profile or use a third-party mail app that supports HTML signatures.

Does Siggly support centralized deployment for Apple Mail?

Apple Mail does not offer admin-level signature APIs like Gmail or Outlook. Siggly provides the optimized HTML and installation instructions, but deployment is per-device on macOS.

Create a Stunning Apple Mail Signature

Design your signature in Siggly and install it in Apple Mail in under five minutes. Try it free.