Unable to send email from Android Phone - Time Warner Internet

This question is about "Unable to send email from Android Phone", with Time Warner Cable internet and apps. 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.

Unable to send email from Android Phone?