Plum Creative owl mark
Plum Signature Studio
Beta
by Plum Creative®
The Plum Creative® Email Signature Tool

Design. Copy. Communicate.

Elevate your correspondence with a signature that mirrors your brand. Our tool allows you to design and deploy a perfectly formatted signature for Apple Mail, Gmail, or Outlook in moments. Pure, reliable, and entirely on-brand.

Heads up — this app is currently in beta testing. Expect rough edges, and thanks for helping us improve it.

01

Your details

02

Brand image

Optional. Square images work best. Max 1.5 MB.

03

Accent color

Live preview
Avery Plum
Brand Designer · Plum & Co.

Your signature

Best path: replace the signature file directly. Pasting into Apple Mail's Signatures pane usually drops your image on send — this avoids that.

  1. Open Mail → Settings → Signatures. Click + on your account and name it something memorable (e.g. Plum). Type any placeholder text and quit Mail completely (⌘Q).
  2. Click Download .html above.
  3. In Finder, press ⇧⌘G and paste:
    ~/Library/Mail/V10/MailData/Signatures (try V9 or V11 if V10 is missing).
  4. Find the newest .mailsignature file (sort by Date Modified). Right-click → Get Info → check Locked off.
  5. Open it in TextEdit. Keep the top header lines (Content-Transfer-Encoding, Mime-Version, etc.) and replace everything below the blank line with the contents of your downloaded signature.html. Save.
  6. Lock the file again (Get Info → Locked). Reopen Mail — your signature is in place.

If the file-swap feels heavy, "Copy rendered" → paste into the Signatures box works for previewing, but Mail will strip the photo when you actually send.