Apple Mail Signatures Disappeared After a macOS Update? Here's How to Get Them Back
You updated macOS and your signatures are gone. Usually they're not deleted — they're unassigned, hidden by an iCloud sync hiccup, or sitting in the previous version's data folder. Work through this in order.
Step by step
Check All Signatures first
Mail → Settings → Signatures → select All Signatures in the left column. Updates often unassign signatures rather than delete them. If yours are listed, drag each one back onto its account — done.
Check the account itself
If an account was re-provisioned during the update (common with iCloud and Exchange), it comes back with no signatures assigned. Select the account in the left column and re-assign.
Check the iCloud Drive Mail toggle
System Settings → your name → iCloud → iCloud Drive → Apps syncing to iCloud Drive → confirm Mail is on. If it flipped off during the update, your synced signatures are hidden, not gone — turning it back on restores them within minutes.
Look in the previous Mail data folder
Mail keeps versioned data folders and updates create new ones. Your old signatures usually still exist on disk: with iCloud Drive Mail on, look in ~/Library/Mobile Documents/com~apple~mail/Data/V…/Signatures; without, ~/Library/Mail/V…/MailData/Signatures. Check the older V folders.
Recover the content
Open the .mailsignature files from the old folder in TextEdit — the body of your signature is inside. Recreate a signature in Mail and paste it back (or reinstall properly per the next step).
Time Machine, if it comes to that
Restore the Signatures folder from a pre-update backup with Mail quit, then reopen Mail.
Make the next update a non-event
Keep your signature re-installable: save the HTML somewhere, or keep it in Autograph's library — after any update, reinstalling is one click instead of an archaeology dig.
Never rebuild a signature again
Autograph keeps your signatures in its own library — after any macOS update, reinstalling into Apple Mail is one click. Photo, logo, and formatting included.
Download Autograph free See the templatesCommon questions
Why does macOS keep doing this?
Major updates migrate Mail's data to a new versioned folder and re-sync with iCloud. The migration occasionally drops signature assignments or whole signatures — it's been reported across Sonoma, Sequoia, and later.
My signatures disappear repeatedly, not just after updates — why?
That's usually an iCloud sync conflict: a second Mac (or an old one still signed in) with different iCloud Drive Mail settings can overwrite the synced signature set. Make sure every Mac on the account has iCloud Drive → Mail set consistently.
Are the signatures gone forever?
Rarely. Between All Signatures, the previous V-folder on disk, and Time Machine, recovery almost always works — the steps above are in the order of most-likely wins.