The SMTP log contains all Simple Mail Transfer Protocol (SMTP) messages sent by the MPE device, as well as any ACK messages received from a Mail Transfer Agent (MTA). In SMPP or XML mode, the SMTP log information appears on the Logs tab of the Policy Server Administration page. You can modify the severity level of messages that are written to the SMTP log on the MPE configuration page. The default severity is WARN. See Configuring Log Settings to modify the settings.