Problems sending email using outlook

I constantly get the failure message 'Mail could not be sent' - The server for account " etc" returned the error "Service not available - too many authenticated connections' Your username / password or security settings may be incorrect. Would you like to try re-entering your password? Yes - No.
When I respond with 'Yes' and then put in my passward, I get the reply Please enter your account ID and password for the SMTP server "mail.btinternet.com" I put in my password and tick the Remember this password in my keychain box but then everything simply repeats itself. I seem to have to go into my Outbox and then click on Send/Receive which then send the email.
Is anyone else having this problem which started a couple of days ago and is sending me nuts!

Outlook is a Microsoft product and not a lot of people here seem to use it. You will get the best and fastest answers to questions about Office:Mac and its components here:
Office for Mac forums

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    Spoiler (Highlight to read)

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