MailMate dont word

What kind of security update?

Do you know how to use a Terminal window?

I suspect the problem is a hidden file located in this folder:

~/Library/Application Support/MailMate/

I'm interested in any files prefixed with a "." (these files are not shown in the Finder).

Yes,i know how to use terminal window!
I am in application support/mailmate/
and i have 7 files prefixed with a "."
this is
Signatures.plist
Sources.plist
Submission.plist
com.freron.MailMate.pid
database.log
Mailboxes.plist
Identities.plist

Prefixed means that it's the first character of the filename. I don't see that in your list. Could you check again?

Ok, i have prefixed with a "." com.mailmate-app.api.default and com.freron.MailMate.pid

And you still get the same type of crash? Are you sure there is not a file named something like .files_...?

Oo,i found,maybe this .files_to_be_written.tmp?

Yes, if this matches a previous report then this file is empty. If it's empty then delete it and relaunch MailMate. If it's not empty then I would like to see it.

I do it,and my mailmate is work now,thank and great jod 10+!!!

I think that the problem was related to the upgrade Security mac, upgrade was associated with the programs that have been downloaded not through the app store

I am sorry,but i found new bug,does not display the date of receipt mail(not received).Only the date is displayed in the last 2 days.