I have started to get this error message: 5.1.3 bad address syntax in my email account. I am using Outlook 2011. It does not appear to be affecting sending or receiving email. I have no idea what it means or how to resolve the issue. Any advice?

I have started to get this error message: "5.1.3 bad address syntax" in my email account. I am using Outlook 2011. It does not appear to be affecting sending or receiving email. I have no idea what it means or how to resolve the issue. Any advice?  My email account is through Optimum online and I am using Airpost Express.
P.S. The error sound "bong" is driving us nuts!

Please post on the Office for Mac product forums that Microsoft hosts. It's their product and they can best troubleshoot the issue.

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