ALLOW TRANSACTIONS PER SESSION

TCP/IP-channel-specific options:  (integer)
This SMTP/LMTP server option sets a limit on the number of messages allowed per connection. The default is no limit. When the number of messages specified is exceeded, then normally the temporary error 451 4.5.3 No more transactions allowed is returned at the MAIL FROM: line; but see the   TCP/IP-channel-specific option which will cause this temporary error  to instead be issued at the RCPT TO: line. See also the   and  (in the case of SMTP)    channel options,  which may be used to set such limits on a per-channel  basis (hence providing finer-grained control than the    option which applies to all channels  handled by the same default Dispatcher SMTP or LMTP service).

See also:
 * TRANSACTION_LIMIT_RCPT_TO
 * transactionlimit Option
 * TCPIP-channel-specific options