SAP Knowledge Base Article - Preview

3810373 - SMTP send setup fails with 535 5.7.139 Authentication unsuccessful in mail adapter - SAP Integration Suite

Symptom

  • An error occurs during SMTP send setup using the mail adapter.
  • Error: jakarta.mail.AuthenticationFailedException: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. 
  • Error (observed):  jakarta.mail.AuthenticationFailedException: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn for more information. [PN2PR01CA0229.INDPRD01.PROD.OUTLOOK.COM 2026-08-14T04:57:21.875Z 08DEF98BB320890B] 


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Environment

  • Product: SAP Integration Suite
  • SAP Cloud Integration

Product

Cloud Integration all versions ; SAP Integration Suite all versions

Keywords

SMTP, mail adapter, 535 5.7.3, Authentication unsuccessful, AuthenticationFailedException, OAuth2, Microsoft 365, Outlook, SMTP.Send, IMAP.AccessAsUser.All, CPI, Integration Suite, iFlow deployment, SMTP AUTH, credentials, SmtpClientAuthentication, 535 5.7.139, Authentication, unsuccessful,  jakarta.mail.AuthenticationFailedException, SMTP, HCI,  , KBA , LOD-HCI-PI-CON-SOAP , SOAP Adapter , Problem

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