ALLOW SESSION BLOCKS

TCP/IP-channel-specific options: ALLOW_SESSION_BLOCKS (integer)
The  TCP/IP-channel-specific option  for the SMTP server imposes a block limit on the session as a whole. The session is disconnected if this limit is exceeded. If MTA transaction logging is enabled,  the reason field in the close ("X") entry will show: Maximum session data limit of xK octets has been exceeded The default of  means no limit is imposed.

See also:
 * MTA transaction logging
 * TCPIP-channel-specific options