Unable to send email from Android Phone

Hi all.  Recently  began having issue where sent emails from my phone are remaining in outbox without sending.  I am using POP3 with my Roadrunner email.  Tried changing different settings without success.  If I am connected to my wifi the email will send but on cellular will not.  I also tried to setup as IMAP but would not complete setup giving not trusted error.  If it matters IMAP is not choice on my phone but is IMAP4 if there is a difference.  I had no problems until recently.  Tried chat support but suggestions were not successful.


Re: Unable to send email from Android Phone

Just to add using following POP3 server settings:


Port 110

Security off


Port 587

Security off

When setting up always fails to setup using cellular but will finish setup when doing on wifi.  

On cellular will receive emails but cannot send email to myself to test.  On wifi I can send email to myself to test.