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TCP/IP-channel-specific options: TRANSACTION_LIMIT_RCPT_TO (0 or 1)

This SMTP/LMTP server option affects the MTA's behavior once ALLOW_TRANSACTIONS_PER_SESSION has been exceeded. The default is 0, meaning that once ALLOW_TRANSACTIONS_PER_SESSION has been exceeded, then the MTA will reject subsequent transactions (during that same session) at the MAIL FROM: command. If set to 1, the subsequent transactions will instead be rejected at the RCPT TO: command. In either case, the rejection will be done via an error:

451 4.5.3 No more transactions allowed 

See also: