The delay results from using a proxy server, which introduces an additional hop for authentication. POP3 and IMAP4 provide access to the basic email features of Exchange Online and allow for offline email access, but don't offer rich email, calendaring, and contact management, or other features that are available when users connect with Outlook, Exchange ActiveSync, Outlook on the web (formerly known as Outlook Web App), or Outlook Voice Access.Įach time a person accesses a POP-based or IMAP-based email program to open his or her Microsoft 365 or Office 365 email, that user will experience a delay of several seconds. For information about features offered by specific POP3 and IMAP4 client programs, see the documentation that's included with each application. The features supported by each email client programs vary. Users can use any email programs that support POP3 and IMAP4 to connect to Exchange Online (for example, Outlook, Windows Mail, and Mozilla Thunderbird).
Disabling Basic authentication will block legacy protocols, such as POP and IMAP. To protect your Exchange Online tenant from brute force or password spray attacks, your organization will need to Disable Basic authentication in Exchange Online and only use Modern authentication for Outlook in Exchange Online.
For more information, see What are security defaults?. If you've enabled security defaults in your organization, POP3 and IMAP4 are automatically disabled in Exchange Online.
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