I cannot view mail messages without opening them in a separate window. What is wrong?
I had issues with mail crashing and restarted mail as prescribed and immediately holding shift key to prevent messages opening and thereafter moved separator between list and messages to the left so that message display pane does not display anything so that I can one by one open them and discard them to prevent the email with un-kosher content to crash mail program. Once done , I cannot adjust the rightmost paneto show images so I have only two panes , mailboxes on left pane and message list on right pane, and I cannot adjust the pane to the right of list of messages to show message contents. How can I correct this? ( Imac 10,1 El capitan )
iMac, OS X 10.11