Hello - Problem started when I set up my current email account that I use on desktop computer using Thunderbird on my iphone. Email on the iphone worked fine. But I did notice that sometimes I had to close the mail app on my iphone before I could use my email account on my desktop. I would get an error message email is locked due to an open session. Then it got to point that I couldn't use email on desktop whether email app on iphone was open or not. I spent 2 hours on phone with internet service provider Spectrum (previously Time Warner Cable). We tried everything in account setting and options. We changed the password for my email account and I even deleted my email account on my iphone. Still getting same error message. After trying some other things repeatedly...I can now receive emails on desktop using Thunderbird but when I try to send an email I get this error message - Sending of the message failed. The message could not be sent using Outgoing server (SMTP) mail.twc.com for an unknown reason. Please verify that your Outgoing server (SMTP) settings are correct and try again. I've checked my outgoing server setting and they are what they should be. So in summary problem started when I tried to use my email account on 2 devices, desktop computer using Thunderbird and iphone using Mail App. I have deleted email account on iphone, and changed my password on email account. I did this because some error messages I got referred to...can't retrieve password. Any help would be greatly appreciated, Scott