Learn more about adding an email address for a recipient
Applies to: Exchange Online, Exchange Server 2013
Use the Email Address page to view, add, change, or delete the email addresses associated with different types of recipients. The primary SMTP address (also known as the default reply address) is displayed in bold text in the address list, with the uppercase SMTP value in the Type column.
Use the Add or Remove buttons to add or remove an email address associated with the recipient. You can add the following types of email addresses:
SMTP address This is the default address type. You can add, change, or delete any SMTP address for the recipient.
To assign a different SMTP address as the primary SMTP address for a recipient, you must disable the option to automatically update an email address based on the email address policy applied to the recipient. Alternatively, you can use the Exchange Management Shell to change the primary SMTP address. For instructions about how to do this for a user mailbox, see Set-Mailbox.
EUM address An EUM (Exchange Unified Messaging) address is used by the Microsoft Exchange Unified Messaging service to locate UM-enabled users within an Exchange organization. EUM addresses consist of the extension number and the UM dial plan for the UM-enabled user. You have to specify a dial plan when you add an EUM address.
Custom address type You can add one of the following supported non-SMTP email address types for the recipient:
EX (Legacy DN Proxy Address Prefix DisplayName)
With the exception of X.400 addresses, Exchange doesn't validate custom addresses for correct formatting. You must make sure that the custom address you specify complies with the format requirements for that address type.
You can also choose to automatically update email addresses based on the email address policy applied to this recipient. If you select this option, all the email addresses associated with a recipient are automatically updated based on changes that are made to email address policies in your organization. For more information, see Email address policies.