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mail send using smtp.office365.com failed
Hi I'm used to send mail from asp.net mvc,C# code but the problem is its not work from site which start with HTTP, not any problem for send mail from site start with HTTPS. I didn't get what's the pr...
Exactly the same happened to me.
I had the following exception:
Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant.
Visit https://aka.ms/smtp_auth_disabled for more information.
You have to allow SMTP for the account (again).
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission#use-exchange-online-powershell-to-enable-or-disable-smtp-auth-on-specific-mailboxes :
This example enables SMTP AUTH for mailbox mailto:email address removed for privacy reasons.
Set-CASMailbox -Identity email address removed for privacy reasons -SmtpClientAuthenticationDisabled $false
https://borncity.com/win/2022/07/13/outlook-streikt-beim-mail-versand-microsoft-hat-smtp-deaktiviert-juli-2022/