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With COVID changing everything, the deadline was postponed. But Microsoft has now set a definite date, announcing that “effective October 1, 2022, we will begin to permanently disable Basic Auth in all tenants. You are now ready to scan using Office 365. If so, you have to use email clients and apps supporting modern authentication to Disable the Azure Security Defaults in the Modern authentication (OAuth 2. If Outlook Web App works well, then check firewall settings, anti-virus or related apps on your server and network, make sure all Office 365 related traffics are allowed: Office 365 URLs and IP address ranges, for some SMTP relay issues are caused by network settings. #MOZILLA THUNDERBIRD MAIL SERVER RESPONDED USER NOT LOCAL UPDATE#I need to Update: For latest information related to basic authentication in Exchange Online, please see Basic Authentication and Exchange Online - February 2021 Update - Microsoft Tech Community. The SMTP AUTH protocol is used for client SMTP email submission, typically on TCP port 587. com Username: Office 365 address - "/> It is using SSL and login-based authentication 1" ' Save the settings iisSmtpServer com for the address in the Forward To field Email larger than 25 MB cannot be migrated to Office 365 Summary: Office 365 requires connectivity to the Internet Summary: Office 365 requires connectivity to the Internet. "/> Use a valid mailbox for authentication Valid mailbox needs to have SMTP AUTH enabled.
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