On My iMac , can I update High Sierra 10.13
I am running High Sierra 10.13 and have a problem with my mail program. I can not send or forward, everything else is fine. I receive all my mail but when I try to forward the top header goes dim and there is no send button.
Did you change ID or Password at Cox, Mail in OSX makes almost impossible to redo your password, you retype it& it sends the old one, sometimes you can change it in Keycahain Acces, but most of the time it's hidden there & requires deleting the Account & setting it up again if IMAP.
Assuming it's a mid 2011 iMac, no. It can't go any higher.
Depends on what year iMac you have.
My I Mac was purchased Nov 2011, I now have High Sierra 10.13, can I update this OS
As Tim stated, no. Not even a Late 2011 iMac.
Who is the eMail provider?
In the Interim until we figure this out, use a browser to log into your WebMail.
My provider is cox.com. Cox is fine on my browser.
I, have High Sierra 10.13, can I update it.
