From: winstonmvp@gmail.com   
      
   Jota.Ce wrote on 11/3/2025 12:55 PM:   
   > Hi there.   
   >   
   > Anyway... Last year, SeaMonkey Mail worked without problems with   
   > institutional mail account (MS 365 ecosystem). Since we are jailed,   
   > SeaMonkey can't retrieve/send mails, but i can't really know why. Maybe   
   > they are blocking the port? At home, that settings work as expected.   
   >   
   > Outlook works, ThunderBird works if i choose Exchange account, but not if   
   > i choose POP acount (didn't try on IMAP).   
      
   OAuth2 required. POP3 and IMAP not supported.   
     Outlook and Thunderbook support OAuth2.   
      
      
   OAuth 2.0 is required for institutional Microsoft 365 accounts because   
   Microsoft has deprecated basic authentication (username/password) for   
   services like Exchange Online, and is now requiring OAuth 2.0 for modern   
   authentication. This means that applications and services must use OAuth   
   2.0 to access M365 data, as most older methods are being phased out to   
   improve security.   
      
   Why OAuth 2.0 is required   
   Security: OAuth 2.0 provides a more secure way for applications to access   
   M365 data without using the user's password directly.   
      
   Modern Authentication: Microsoft is moving to modern authentication   
   methods, and basic authentication for protocols like POP, IMAP, and SMTP   
   is being disabled for new accounts and eventually for all accounts.   
      
   Application access: Any third-party application or service that needs to   
   interact with M365 services, such as sending emails via Exchange, must be   
   configured to use OAuth 2.0.   
      
   >   
      
      
      
   --   
   ...w¡ñ§±¤ñ   
      
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