Can't send emails via Apple account (smpt errors)

I've been having this problem, on again and off again, for over two months. I even did live chats with Road Runner about the issue. It seems to be temporarily resolved. I've been getting these error messages:  Can't send message with using the server stmp-server.neo.rr.com. 
The server response was: 4.1.8 - Domain of recipient does not resolve [R0309001]
Use the pop-up menu below to try a different outgoing mail server.  All messages will use this server until you quit Mail or change your network settings.
or
The server response was: 5.5.2 RCPT TO syntax error
Use the pop-up menu below to try a different outgoing mail server.  All messages will use this server until you quit Mail or change your network settings.
My SSL is unchecked, there's no password for authentication, my port numbers and server emails are fine. Well, except the smtp. one. It keeps saying smpt, when I fixed it so many times. Is there any way to fix this problem on my six year old Imac. It's ok to send an email out to one person, but not more than one. I have the same troubles at the RR website.

Many ISP mail servers are restricted and will not permit mail to be sent that originates from outside their network (which the cellular data network is).
Check with the mail provider to see if you need to use a different SMTP server when using a mobile device.

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