Why is mail deleting outgoing server information?
On several occasions recently when trying to send email I get a message that it can't be set because no outgoing server has been selected. When I go to preferences to try to correct, I find that the list has been cleared and I have to enter them all over again. What's going on?
MacBook Pro (15-inch Early 2011), OS X Yosemite (10.10.4)