Can't delete mail in Mac Mail
Mac OS X 10.12.6, late 2012 iMac.
Mail behaving strangely,latest problem is that mail in Trash folder will not delete using the Mailbox menu=>erase deleted messages=> in all accounts.
Nothing happens when I choose this.
The 206 message in my Trash folder just stay there.
I have done the mailbox rebuild several times, did not help.
Any ideas?
thanks
Caroline
iMac (21.5-inch, Late 2012), macOS Sierra (10.12.5)