2700110 - Error code XS751 with STARTTLS occurs in transaction SOST during mail sending

• Error message XS751 "Message cannot currently be transferred to node & due to connection error" occurs in transaction SOST when a mail cannot be sent from SAP system.
• The long text contains the "451 TLS required but server does not offer STARTTLS" error message and the HELO keyword, which indicates the use of the standard SMTP protocol for communication, can be found instead of EHLO in the level 3 ICM trace.

• SAP Basis 731 SP006 or higher
• Kernel 721 or higher

XS751, XS 751, STARTTLS, "Message cannot currently be transferred to node & due to connection error", SOST, SMPT, TLS, TLS authentication, server does not offer STARTTLS, 451 TLS required, "Nachricht an Knoten & wg. Verbindungsfehler momentan nicht übergebbar", mail sending error, email, email sending, 451 5.7.3 STARTTLS is required to send mail, , KBA , is required to send mail , 5.7.3 starttls is required , 451 5.7.3 starttls is required to send , 5.7.3 starttls is required to send mail , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , Problem