Microsoft promises that SMTP authentication will not be affected, however our preliminary tests do not prove that. How does this affect me? If you use Recovery Manager for Exchange and want to expand an O365 mailbox to view content, you see logon issue.
原因
On October 1, 2022, Microsoft will start to randomly select tenants and disable basic authentication access for several Exchange Online protocols, including MAPI, POP, IMAP and more.
解决办法
Workaround Microsoft is offering a one-time basic authentication re-enablement for specific protocols. We recommend following steps from this Microsoft article. Basic Authentication Deprecation in Exchange Online and request a one-time SMTP basic authentication re-enablement. Status The Recovery Manager for Exchange team is developing a resolution and targeting a Q4 release. We apologize for the inconvenience this issue may have caused and we are working quickly to correct it.
