Error Message Every Time I Send and Receive

[Don]

I use Microsoft Entourage 2008 Mac 12.2.3

Below is the error message I receive>

5.1.2 or other punctuation after the recipient’s email address.
22sm4180816pzk.1

Error: -17099

How can I get rid of this message?

Thanks.

 

[Corentin Cras-Méneur]

Error: -17099

How can I get rid of this message?

You have all the explanations for this error message here:
http://www.entourage.mvps.org/error/number.html#error-17099

Corentin