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Microsoft Exchange Server 2013 : Mailbox management - Mail-enabled contacts, Mail users

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12/3/2014 3:03:25 AM

Mail-enabled contacts

Mail-enabled contacts are a convenient way to add external correspondents (people who have email accounts outside your Exchange organization) to the GAL. Typically, contacts represent people working in other companies to whom a number of users need to send messages on a frequent basis. They are commonly used to facilitate contact with specific individuals or utility mailboxes for external vendors such as PR agencies. Exchange 2013 groups both mail users and mail contacts under Contacts in the recipients section of EAC.

To create a new contact, under Recipients, open the Contacts section and click + (New). Note that the drop-down menu provides options to create a new mail contact or a new mail user but that the default is to create a new mail contact. The screen EAC displays is straightforward; essentially, all you’re doing is creating an Active Directory object to hold some details of the contact, including her email address.

Creating a mail contact with EMS is more interesting because more options are exposed. Here’s an example of a command that creates a new mail-enabled contact. Note that the email address and the name properties must be unique.

New-MailContact -ExternalEmailAddress 'SMTP:[email protected]' -Name 'Jones, David (Fabrikam)'
 -Alias 'DavidJones' -FirstName 'David' -Initials '' -LastName 'Jones' -OrganizationalUnit 'contoso.com/Exchange Contacts'
 –DisplayName 'David, Jones (Fabrikam)'

It’s also common for external contacts to be given a suffix so users understand that this object represents someone outside the organization, which might be important to know when they are addressing a message or browsing the GAL and have to select between two objects that have the same name. If the contact belongs to a specific company, you can use the company name as the suffix; otherwise, a general-purpose value such as (External) does nicely.

This command uses only a small subset of available parameters to manage the new mail contact. For example, you can define that the mail contact should receive messages only in plaintext format of a maximum message size.

Set-MailContact –Identity 'Jones, David (Fabrikam)' –MessageFormat 'Text'
–MessageBodyFormat 'Text' –MaxReceiveSize 500KB –UsePreferMessageFormat $False

Like other mail-enabled objects, contacts support moderation, so you can assign a moderator for the contact so that any messages sent to it are redirected to another user for approval before Exchange transmits them to the contact. Assume that you have a contact for a PR agency, but you don’t want everyone in the organization to send requests for interviews, new advertising campaigns, and other requests to the agency. You could channel these messages to a moderator with a command like the following. Notice that I like to use the new MailTips feature to provide users with an immediate indication that sending to a contact might not result in immediate delivery.

Set-MailContact –Identity 'PR Agency' –ModeratedBy 'Cook, Kevin' –ModerationEnabled $True 
-SendModerationNotifications 'Always' –MailTip 'Messages to the PR Agency are moderated by Kevin Cook'

Another way of putting a block on users sending to a contact is to set it up so that Exchange allows only messages sent by specific users. Using a group for this purpose is the most convenient method from an administration perspective.

Mail users

Mail users are much like contacts in that both object types have external email addresses. However, there is one important difference. Contacts are usually linked to people who have no relationship with your organization, but mail users are linked to Active Directory accounts. You can therefore think of mail contacts as being most suitable for people who work outside your company, whereas mail users are often the most appropriate choice for those who work inside the company.

Inside Out Mail users and security groups

In essence, Exchange supports this recipient type to enable you to incorporate users in the GAL even when they use a different email system. Because mail users are linked to Active Directory accounts, they also are security principals and can therefore be added to security distribution groups that grant access to resources. You can add contacts to security groups, too, but this has no effect other than allowing the contacts to receive any messages sent to the group.

Mail users don’t have their own section in EAC because they are treated as a form of contacts. Open Recipients, choose Contacts, and then click the drop-down menu beside the + (New) option. Select Mail User from the menu. When you create a mail user, you associate him with an existing Active Directory account or create a new account. In the latter case, you have to provide details for the account in much the same way as you do when you create a new account for a mailbox. Figure 1 shows a new mail user being created. In this case, an existing user account is selected, so no further information is required.

A screen shot from EAC showing the fields that have to be populated when a new mail user is created.

Figure 1. Creating a new mail user

The EMS code to create a brand-new mail user looks very similar to the code that creates a new mailbox. You must encode the password string into a variable before using it with the New-MailUser cmdlet (or, if you execute this code interactively and omit any mention of the password, EMS prompts you for it). Make sure that the alias and name properties are unique.

New-MailUser -Name 'Hamlin, Jay' -Alias 'HamlinJay' -OrganizationalUnit 'contoso.com/Exchange Users'  
-UserPrincipalName '[email protected]'
-SamAccountName 'Hamlin' -FirstName 'Jay' -Initials '' -LastName 'Hamlin'
-ResetPasswordOnNextLogon $True -ExternalEmailAddress 'SMTP:[email protected]'
-Password $Password –DisplayName 'Hamlin, Jay'

Like contacts, mail users support moderation and MailTips. However, EMS is a little inconsistent in its cmdlets; you cannot set up a MailTip with the New-MailUser cmdlet. Instead, you have to apply the MailTip after the mail user is created with the Set-MailUser cmdlet. For example:

Set-MailUser –Identity 'Hamlin, Jay' –MailTip 'Messages sent to this address only support plain text messages'
Set-MailContact –Identity 'PR Agency' –AcceptMessagesOnlyFromSendersOrMembers 'PR Department' 
–MailTip 'Only members of the PR department are allowed to communicate with the PR agency'
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