Let's get your email back on track Donna! You can tweak email settings by going to Settings>Mail, Contact, Calendars>(Your email account)>and modify your email password. You can also try removing your email from the phone, and setting it back up again. Please keep us posted, and let us know if this resolves your issue.
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First it would be a big help if you said what email you are trying to set up. Go to the ISP support site and get the proper settings to set up email. Incoming is normally
pop-server.your ISP name.com
SMTP. Your ISP name.com
I have found going to the app store and getting the stand alone email app works much better if there is one available. (Hotmail/Outlook or Yahoo or AOL Mail)