if its using wifi and u have dsl u need to authenticate with the dsl username and pass. for example, lets say i have att dsl, and a pop email domain ppcgeeks.com. my incomming mail is
user@ppcgeeks.com, pop.ppcgeeks.com. my outgoing would be
user@att.com, smtp.att.yahoo.com.
test it out using your cellular data connection.
also, i have found that if you copy and paste settings in mail setup it wont work. you need to type each setting in one letter at a time. no copy and paste in email setup.