Suddenly my Outlook and AOL accounts stopped sending emails. I deleted both accounts, set them up again and they are now working as before. The emails that were already stored on my phone appeared in the proper places too.
This may not work for everyone as I have seen WIFI problems posted in this forum that are supposedly not resolved in the software. Also a third party email application may make things easier. (Check your notifications every now and then as I didn't know my emails were not going out.)
To delete an email account, open your email, then you have to select the specific email account at the top with the drop down menu (if you have more than one), then touch the hardware menu button at the bottom of the phone, select more, then select settings, then select "Delete account". A few cases of carpel tunnel syndrome and you should be good to go!