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This article describes how to add an alias email address to a user's Microsoft Office 365 account by using Microsoft Exchange Online and how to configure Microsoft Outlook to send email messages as this alias. These steps involve setting up a "dummy" POP3 account by using the user's alias.

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Step 1: Add an alias to a user's Office 365 account

In Office 365 for enterprises,

  • Sign in to the Office 365 portal.
  • In the header, click Admin.
  • Under Exchange Online, click Manage.
  • In the left pane, click Users & Groups, and then click Mailboxes.
  • In the list of users, select the user to whom you want to add an alias email address, and then click Details.
  • Expand E-Mail Options. A list of user's email addresses is displayed.
  • Click Add to add a new alias email address.

smtp:abc@xyz.com

In Office 365 for professionals and small businesses,

  • Sign in to the Office 365 portal.
  • In the header, click Admin.
  • Under Outlook, click General settings.
  • In the left pane, click Users & Groups tab, and then click Mailboxes.
  • In the list of users, select the user to whom you want to add an alias email address, and then click Details.
  • Click E-Mail Options. A list of user's email addresses is displayed.
  • Click Add to add a new alias email address.

Step 2: Obtain the POP, IMAP and SMTP settings of the user's Office 365 account

  • Sign in to the Office 365 portal, and then in the header, click Outlook.
  • Click Options, and then click See All Options.
  • In the left navigation pane, click Account, and then click My Account. Under Account Information, click Settings for POP, IMAP, and SMTP access.
  • The Protocol Settings window lists the POP, IMAP, and SMTP settings for the user. Keep this window open or copy the settings information. You will need the information in the next step.

Step 3: Configure Outlook to send email messages as the alias

  • Open Outlook with the Office 365 profile.
  • Click File, then click Account Settings, and then click Account Settings.
  • On the E-mail tab, click New.
  • Click Manually configure server settings or additional server types, and then click Next
  • Click Internet E-mail, and then click Next
  • Enter the following information:
    • Your name: The user's display name
    • E-mail Address: The alias that you want to send from.
    • Account Type: POP3
    • Incoming mail server: Use the POP setting that you obtained in step 2. It should resemble pod#####.outlook.com.
    • Outgoing mail server (SMTP): Use the SMTP settings that you obtained from step 2. It should be the same or similar to the POP3 setting.
    • User name: The user's Office 365 sign-in name/email address.
    • Password: The user's Office 365 password.
  • Click More Settings.
  • Click the Outgoing Server tab, and then click to select the My outgoing server (SMTP) requires authentication check box.
  • Click the Advanced tab, and then click to select the This server requires an encrypted connection (SSL) check box.
  • In the Outgoing server (SMTP) box, type 587.
  • In the Use the following type of encrypted connection list, click TLS.
  • Under Delivery, set the delivery options that you want.
  • Click OK.
  • Click Next. The account settings that you entered are tested. When these tests are completed, click Close.
  • Click Finish.

A POP3 account is created for the alias. However, you must also have to make sure that this POP3 account does not send and receive items in Outlook.

Make sure that the POP3 account does not send and receive items in Outlook

  1. In Outlook, click File, click Options, and then in the left navigation pane of the Outlook Options window, click Advanced.
  2. Under Send and receive, click Send/Receive.