I have added a new mail signature and cancelled a few older ones. This is okay for 24 hours or so & then when I open mail the new sig has disappeared & the old ones are back. No idea why or how to deal with his. Annoying, however.
iMac Line (2012 and Later)
Whew! There are some more Mail things that start with com.apple.mail in...
/Users/YourUserName/Library/Containers
Not sure what all they do.
Did we ever try this?
To find out if it's system wide or user specific, try this...
Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.
Does it work in the new account?
Actually, none of this worked. With a new signatures file installed, I put in one new signatures. This worked for the day. The next morning when I rebooted my mac, the signature file was empty — i.e. the new sig had been deleted. This has now happened three days in a row & is becoming unbearable.
So I now have moved the old sig files back into the Library from the desktop, edited the sigs down to the 4 I want to have, added one new one & will see what happens. If the pattern stay constant, they'll be okay today & will have disappeared (or reverted to the old settings) by tomorrow.
Actually I realized this probably wasn't a matter of time. So I rebooted & yes, as feared, after the reboot the signatures had reverted to the old ones — all my alterations/additions had disappeared. Back to square one.
In fact, I have tried various simple changes on an existing signature — the application does not remember any of them & whenever I reopen MAIL it will have reverted to the old signatures.
Apple figured we didn't have enough to do, they hid that folder...
Unhide the Library Folder, the Apple Way
There's another way to access the hidden Library folder without having to make use of Terminal, which has the side effect of revealing every hidden file on your Mac. This method will only make the Library folder visible, and only for as long as you keep the Finder window for the Library folder open.
Access the Library the Easy Way (OS X Mavericks and later)
If you're using OS X Mavericks or later, you have the easiest way of all to permanently access the hidden Library folder. This is the method we use, and we recommend it for anyone who wants permanent access and isn't worried about accidentally modifying or deleting a file from the Library folder.
With Mail & Sys Prefs both closed, I'd move these 2 files to the Desktop, V4 likely V5 on your Mac...
AllSignatures.plist
AccountsMap.plist
In this folder...
/Users/YourUserName/Library/Mail/V4/MailData/Signatures/
Thanks. Was able to open folders & located the two files you suggested to move. They were in V5/MailData/Signatures (Oh, for got already: I think they were in /MailData. Moved them to desktop. how can I check if this solved my problem (without waiting for a day or two...)?
So to check after I placed the two files on my desktop, removing them from the Library, I closed the mail application,then reopened it. Now there are no more signatures at all available, i.e. none are clickable in an email & when I open the Mail preferences, there are no more sigs in there at all. Does this mean that I now have to start recreating sigs?
Oh yes, I forgot to mention that, or you can quit Mail & move those back, likely have to replace the newly created ones.
Can't find said folder
Mail signature problems
