SMTR-811 — Opening mail report message
This line appears in the log whenever a new mail (SMTP MAIL command) is received. It determines assignment of the internal message identifier (MSGID) to the new mail and also value of the sender address (argument to the MAIL command) for this mail and source of it (client IP address or SMTP-PROXY in the case of DSN message).
The result of the mail processing summarizes SMTR-819 message.