erudit

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The concept you are trying to make it work, is called spoofing in messaging world. As advise above, just create new id and mailbox and let user use it. You can have user use OWA to access other mailboxes.
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The concept you are trying to make it work, is called spoofing in messaging world. As advise above, just create new id and mailbox and let user use it. You can have user use OWA to access other mailboxes.

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We have a client that would like to tidy up their mailboxes by adding multiple alias to their main exchange account and to be able to send as an alias.<br />
They use MS Exchange 2010 and when I have tested this by adding another alias to an account I get the following bounceback message if I send as an alias.<br />
<br />
Delivery has failed to these recipients or groups:<br />
<br />
{Recepeintant email address}<br />
&nbsp;You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission.<br />
<br />
Yet there appears to be no place to add such permissions if the account is an alias,
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We have a client that would like to tidy up their mailboxes by adding multiple alias to their main exchange account and to be able to send as an alias.
They use MS Exchange 2010 and when I have tested this by adding another alias to an account I get the following bounceback message if I send as an alias.

Delivery has failed to these recipients or groups:

{Recepeintant email address}
 You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf of the correct sender, or request the necessary permission.

Yet there appears to be no place to add such permissions if the account is an alias,

Sending as an Alias

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

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

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.