Why do I have to Quit mail to refresh my mailboxes on the iMac?

I have an iMac OS X Lion 10.7.4. A recent purchase. 
I have an iPad and an iPhone (regrettably updated to 6.0 - don't like the map and can't stand the fact all my facebooks friend's birthdays have automatically gone into my diary!!)
I have a yahoo email account and have all my devices pointing to my yahoo address for email.
Until recently all my devices were generally sync'ed to yahoo.  I say generally as the iMac keeps losing my email password and can't send or connect to yahoo until I re-type my email password - why?!!
Unfortunatly now in addition to the above my mailboxes on the iMac only refresh if Quit mail and restart it.  It does not refresh automatically, not when I select Inbox or any other mailboxes for that matter.
I have checked my setting and that all seems normal.
Any help would be really appreciated.
Thanks
Fataneh

Please forgive my ignorance.
I have found Keychain Access but I don't understand what I have to do next.
Which Category?  Passwords?
Also which one is the mail server?  imap.mail.yahoo.com or smtp.mail.yahoo.com (both have the same password)
or any other enteries?
Thanks for your help

Similar Messages

Maybe you are looking for

  • URL link in rows/colomns of a report web application designer.

    Hi, I would like to create a URL link in a report which jumps to documents on livelink. For example: 1.  bw    30.000    www. google.nl 2.  sap   40.000    www. sap.com 3. basis  50.000   www. nu.nl etc. etc. Do all the rows have different URLS, is t

  • Why did I receive an error message when I ran Disk Utility?

    When I installed OS X Mountain Lion, then ran Disk Utility, it responded with the message "Warning SUID file 'System/Library/Core Services/RemoteManagement/ARDAgent.spp/Contents/MacOS/ARDAgent' has been modified and will not be repaired."

  • Apps Not Showing Up on Home Screen

    I just updated to iOS 7, and upon setting up my phone, I discover all of my apps (except for the pre-loaded ones) are not on the home screen. They're definitely still on the phone as they show up in my settings, and I can access them from my control

  • Inserting Flash Video - Syntax Error

    Hello, I used the Insert menu to add a flash video file to my page. There is some kinf of syntax error on this line: swfobject.registerObject("FLVPlayer"); I am validating for HTML4. The video plays in preview, but not when uplaoded. Any ideas? Mike

  • Can't enable Photos on PC - is grayed out

    Photostream was working until iOS 7 came out and the iCloud program updated. Now I can't enable Photos. It's grayed out. Can someone help. Thanks.