Switched from an iPhone 3 to Samsung Galaxy s4 (new android user) and all was set up fine to begin with -- email worked receiving and sending. Then I started playing with app settings to disable ones I didn't want, to control automatic updates which were chewing through my data usage and recently my emails began failing to send. The incoming and outgoing email settings are correct. Is there any way to figure out which app caused the conflict with email, or do I have to restore to factory settings? Can anyone help me?