Configure whether to perform HAT rejection at the message recipient level.By
default, HAT rejected connections will be closed with a banner message at the
start of the SMTP conversation.
email is rejected due to HAT “Reject” settings, AsyncOS can perform the
rejection at the message recipient level (RCPT TO), rather than at the start of
the SMTP conversation. Rejecting messages in this way delays the message
rejection and bounces the message, allowing AsyncOS to retain more detailed
information about the rejected messages. For example, you can see the mail from
address and each recipient address of the message which is blocked. Delaying
HAT rejections also makes it less likely that the sending MTA will perform
you enable HAT delayed rejection, the following behavior occurs:
MAIL FROM command is accepted, but no message object is created.
RCPT TO commands are rejected with text explaining that access to send e-mail
sending MTA authenticates with SMTP AUTH, they are granted a RELAY policy and
are allowed to deliver mail as normal.
configurable from the CLI
listenerconfig --> setup command.