FAST SMTP SESSION TIME LIMIT

TCP/IP-channel-specific options: FAST_SMTP_SESSION_TIME_LIMIT (integer)
This SMTP server option controls the time threshold for whether or not to create a   file in cases where the SMTP  connection has aborted (for instance, due to an SMTP client timing out)  after the MTA SMTP server has received the final "." terminating the data, but before the MTA has acknowledged receipt with a "250 2.5.0 Ok" message. If the transaction (message transfer) has taken more than this amount of time, in seconds, then  normally (see the    TCP/IP-channel-specific option) a    file will be created in such cases where the  MTA has not been able to successfully send back its acknowledgement of  receipt of the message. If a transaction has taken less than the specified amount of time, in seconds, then a    file will not be created. The default is 30.

See also:
 * REUSE_TIMED_OUT_TRANSFERS
 * TCPIP-channel-specific options