A per-mailbox setting that overrides the tenant-wide setting.An organization-wide setting to disable (or enable) SMTP AUTH.There are two kinds of settings to disable or enable the SMTP client authentication. In Exchange Online, by default, the SMTP Client Authentication will be disabled for all Office 365 mailbox accounts in a way to prevent users from using basic authentication. The server response was: 5.7.57 SMTP Client was not authenticated to send anonymous mail during MAIL FROM The SMTP server requires a secure connection or the client was not authenticated. You might have received the following error message when you try to use Office 365 user mailbox account for SMTP client access to send emails.
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