said by LPineiro :Hello:
For a few months I've had the same problem described in this thread ( Had it in a T-Mobile Galaxy S2, and now with a new S5). E-mail is OK when on Wi-Fi, but cannot contact the Roadrunner email server while on T-mobile's cellular network. THE ISSUE IS NOT SOLVED!!!! For a while, my workaround was a daily routine of deleting the e-mail account, re-booting the phone, and adding the e-mail account again. Today that's not working, and I'm sick and tired of not having the service I'm paying for... Lot's of finger-pointing between Road Runnne/Time Warner, and T-mobile, but no solutuion. I'm puzzled since my cubicle neighbor at work has an S5 with AT&T, with RR e-mail, and he doesn't have any problems... An interface has two sides, so both T-Mobile and Road Runner have to work on this issue together. It needs to be elevated to higher levels, as regular tech support floks don't seem to have a clear understanding of the nature of the problem. Brighthouse: What say you?
I would be frustrated as well. Can you post the mail servers that you are using?