Exchange Team Blog 4 MIN READExchange Online to retire Basic auth for Client Submission (SMTP AUTH)The_Exchange_TeamPlatinum ContributorApr 15, 2024 Update 6/11/2025: We updated the timeline of this deprecation mentioned in this post. Exchange Online will permanently remove support for Basic authentication with Client Submission (SMTP AUTH) gra...Show MoreUpdated Jun 12, 2025Version 4.0
Chipper2225Copper ContributorOct 31, 2024IanMcDonald Thank you for the clarification! much appreciated!
