Enable or Disable POP3 or IMAP4 access for a user in Exchange Online
By default, POP3 and IMAP4 are enabled for all users in Exchange Online. You can disable them for individual users. For additional information related to POP3 and IMAP4, see POP3 and IMAP4.
What do you need to know before you begin?
Estimated time to finish: two minutes.
If you've enabled security defaults in your organization, POP3 and IMAP4 are already disabled in Exchange Online. For more information, see What are security defaults?.
You need to be assigned permissions before you can perform this procedure or procedures. To see what permissions you need, see the "POP3 and IMAP4 settings" section in the Feature permissions in Exchange Online topic.
For information about keyboard shortcuts that may apply to the procedures in this topic, see Keyboard shortcuts for the Exchange admin center.
Tip
Having problems? Ask for help in the Exchange forums. Visit the forums at Exchange Online or Exchange Online Protection.
Use the EAC to enable or disable POP3 or IMAP4 for a user
In the EAC, navigate to Recipients > Mailboxes.
In the result pane, select the user for which you want to enable or disable POP3, and then select Edit
.In the User Mailbox dialog box, in the console tree, select Mailbox Features.
In the result pane, under Email Connectivity, do one of the following:
To enable POP3 for the user, under POP3: Disabled, select Enable.
To enable IMAP4 for the user, under IMAP4: Disabled, select Enable.
To disable POP3 for the user, under POP3: Enabled, select Disable.
To disable IMAP4 for the user, under IMAP4: Enabled, select Disable.
Select Save.
Use Exchange Online PowerShell to enable or disable POP3 or IMAP4 for a user
This example enables POP3 for the user Christa Knapp.
Set-CASMailbox -Identity "Christa Knapp" -POPEnabled $true
This example enables IMAP4 for the user Christa Knapp.
Set-CASMailbox -Identity "Christa Knapp" -IMAPEnabled $true
This example disables POP3 for the user Christa Knapp.
Set-CASMailbox -Identity "Christa Knapp" -POPEnabled $false
This example disables IMAP4 for the user Christa Knapp.
Set-CASMailbox -Identity "Christa Knapp" -IMAPEnabled $false
How do you know this worked?
In the EAC, navigate to Recipients > Mailboxes.
In the result pane, select the user for which you want to enable or disable POP3 or IMAP4, and then select Edit.
In the User Mailbox dialog box, in the console tree, select Mailbox Features.
In the result pane, look under Email Connectivity.
If POP3 is disabled for the user, you'll see POP3: Disabled.
If IMAP4 is disabled for the user, you'll see IMAP4: Disabled.
If POP3 is enabled for the user, you'll see POP3: Enabled.
If IMAP4 is enabled for the user, you'll see IMAP4: Enabled.
Select Save.