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What is the specific delivery error for that one recipient?
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What is the specific delivery error for that one recipient?

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The message is deleted and he didn't send me.
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The message is deleted and he didn't send me.

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It could be a problem with the legacy email address. You need to add the address in delivery failure as X500 address on the mailbox
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It could be a problem with the legacy email address. You need to add the address in delivery failure as X500 address on the mailbox

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I have an user which when he try to reply all when he receive an email, email is not send to one of the recipients, saying that the message cannot be delivered. If he explicitly write her email in the new mail , email is successfully send. Any idea how to fix this problem?
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I have an user which when he try to reply all when he receive an email, email is not send to one of the recipients, saying that the message cannot be delivered. If he explicitly write her email in the new mail , email is successfully send. Any idea how to fix this problem?

reply on email does not send a message

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.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.