REJECT RECIPIENTS PER TRANSACTION

TCP/IP-channel-specific options: REJECT_RECIPIENTS_PER_TRANSACTION (integer)
This SMTP server option may be used to specify a limit on the number of recipients that will be accepted during a single transaction. For the SMTP server, it also limits the number of VRFY address verifications that may be performed. (Note that the count of actual recipients, RCPT TO:, is separate from the count of verifies, VRFY:;  that is, VRFY:&#x27;s do not count against the RCPT TO: limit, nor do RCPT  TO:&#x27;s count against the VRFY: limit; each is limited  independently to the    value.)  If the RCPT TO: limit is exceeded, then at the DATA command the entire  message to all recipients will be rejected with a temporary  error: 451 4.5.3 Transaction blocked; too many recipients specified (Compare with    which rejects merely the  excess recipients with a  451 4.5.3 Too many recipients specified error at the RCPT TO: command, allowing the message to be submitted to  the initial recipients.) Attempts to VRFY more addresses than the limit  will be rejected with a  451 4.5.3 Verification blocked; too many operations performed error. The default is no limit. Note that if both   and     are set, with    being set to a larger  value than  , then once    is exceeded any additional recipients  receive a temporary error, and once     is exceeded then the entire message is rejected with a temporary error.

See also the  and    channel options, and the    and    MTA options.

See also:
 * ALLOW_RECIPIENTS_PER_TRANSACTION
 * recipientcutoff Option
 * disconnectrejectlimit Option
 * ldap_recipientcutoff MTA Option
 * ldap_domain_attr_recipientcutoff MTA Option
 * TCPIP-channel-specific options