TS3276 could not connect to this iCloud IMAP server

Question

I am trying to remove my sim*** @btinternet.com account and use sim*** @me.com account.  I am unable to send emails but I can receive.
<Email Edited by Host>

Answer 1

Hello Simon,
If you would like to remove or add any email accounts this can be done in the System Preferences > Mail, Contacts, and Calendars.
If you mean the signed in Apple ID for iCloud, then that can be changed in System Preferences > iCloud.
On the other hand, if you would like to troubleshoot not being able to send email from your computer, here is a great resource to assist.
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Open Mail Connection Doctor
In Mail, choose Window > Connection Doctor.
Tip: If you see a spinning gear in Mail or the Mail Connection Doctor, choose Window > Activity to learn what Mail is doing.
Collapse All Sections | Expand All Sections (Or, click to a specific topic below that lists your issue.)
The Connection Status at the top of the Mail Connection Doctor window shows a red dot () and "Mail was unable to connect to the Internet."
Mail Connection Doctor shows all green dots () in the Status column
Mail Connection Doctor shows one or more red dots () in the account Status column
Take care,
Sterling