How to delete all mail from 'Sent' folder?
Sorry to add to the plethora of posts related to this, but every case seems to be different. My e-mail account (on my Mac computer and on my iPhone 3G) is BTinternet/Yahoo. My 'Sent' folder on the computer when I open the mail page (the webmail one, not anything to do with a mail client) has hundreds of e-mails sent from my computer stretching back long before I was given the iPhone. When I connect my iPhone to my computer, they all appear in the 'Sent' folder on the iPhone. I have three questions:
1. How can I stop this happening? I only want mail sent from the iPhone to appear in the 'phone's 'Sent' folder. (Deleted/trashed mails that are in the 'Deleted' folder on my computer do NOT appear on the 'phone, so why do 'Sent' ones appear?)
2. Is there any way of deleting all these 'Sent' mails from my iPhone all at once instead of one by one?
3. Is there any way of setting the 'phone automatially to delete mails from the Inbox or the 'Sent' folder after a certain time has elapsed?
Thanks to anyone with words of wisdom relating to these questions.
Mac mini, OS X Mountain Lion (10.8.5)