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MS Exchange Server - Error replying send

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When some users attempt to reply to a sender's (another internal user) mail, it got an error that the address (of the sender) is not vaild. This occurs for different users and different senders and it occur at random. Appreciate guide on the fix onMS Exchange server for the above. Thanks.

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by melodyj

I would check to see which order the recipient's addresses are processed. In Outlook go to Tools, Services, and to the Delivery tab. Make sure that Microsoft Exchange Transport is listed before Remote Transport and Internet Mail.

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