I do have all the information I need to set up the new account, but unless I can enter the ports so the connection can be made, I can't establish the account. Now in OS Sierra, I am only allowed to specify the Name (Email), User Name, Password, Connection type, but once I get to the Account type/Incoming and Outgoing Mail Servers, I am not allowed to specify ports and therefore connect to the server I want to verify and establish the email account. It use to be possible when you set up a new account in Mail to specify the ports, account type (POP, IMAP), SSL, Password, etc all before actually trying to connect to the server. I need to add the ports when I set up the new account or it won't connect to the mail server. Now when I try and create the new account through mail>add account, because I can't add the ports in during the 'add account' portion of adding a new account, it won't connect and create the new account.

I spoke to a tech rep and tried to make the changes, but that wasn't working, so I deleted the Spectrum/Charter account opting to start over. They told me it was an Apple problem but I was able to set up an account through another mail server and connect, so it is a charter/spectrum problem. I have been unable to connect to charter since Nov. Now tap your phone number of choice and make sure, the checkmark appears next to it.

From there, scroll down to and tap Messages and then Send & Receive to configure iMessage’s defaults for starting new conversations. I had an account in Mail for another provider (Spectrum/Charter). To use a phone number rather than an email address, we will need to open the Settings.

Set default mail for mac numbers