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I have a user that at certain times when she send to multiple users, she gets &quot;Could not complete the operation. One or more parameter values are not valid.&quot; error message balloon and she cannot send the email. I have already checked every single email address in the To: and found all the email addresses are complete and valid. <br />
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This error only happens occasionally only. Also attached screenshot of error message.<br />
<a href="https://filedb.experts-exchange.com/incoming/2014/10_w42/877525/Oulook---parameter-v1.jpg" target="_blank" class="file-inline" title="Parameter error (52 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Oulook---parameter-v1.jpg</a>
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Oulook---parameter-v1.jpg

I have a user that at certain times when she send to multiple users, she gets "Could not complete the operation. One or more parameter values are not valid." error message balloon and she cannot send the email. I have already checked every single email address in the To: and found all the email addresses are complete and valid. 

This error only happens occasionally only. Also attached screenshot of error message.

Invalid parameter when sending email to multiple emails

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.