Have you changed ISP's recently?
If your ISP is different from the mail server, then a lot of mailservers won't permit you to send mail through them. This is to prevent spammers from hijacking the server to send anonymously.
It looks like you might be connecting to centurytel? If your IP is in a range not recognised by stevesscoring.com_hostISP then this is the issue.
Set outlook to send thru your connection ISP, keeping the old stevesscoring address in the 'from' setting. The mail will be sent thru your ISP's smtp server, but will still have your old address for people to reply to.
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