my email is not sending says offline
my email not sending says offline
iMac (24-inch Early 2009), iOS 7.1.1
First port of call is your ISP. Take a look at this troubleshooting guide from Apple, then call.
OS X Mail: Troubleshooting sending and receiving email messages
Your 24" iMac does not run on iOS, however. Perhaps you could correct that and let us know what OS X you are using. That could affect Mail.