Membership in which sender group will cause the C-Series-to skip checking the SMTP envelope's "rcpt to" field against the RAT?

Question

Options

• ASUSPECTLIST
• BWHITELIST
• CRELAYLIST
• DBLACKLIST
• EUNKNOWNLIST

• A
  4% (2)
• B
  2% (1)
• C
  94% (46)

Explanation

Membership in RELAYLIST causes the C-Series to skip RAT validation because relay hosts are authorized to send outbound mail through the appliance to external recipients - checking the RAT (which controls accepted local recipients) is irrelevant for a relay transaction. Essentially, the appliance trusts RELAYLIST members to route mail to any destination without validating the RCPT TO against its internal recipient list.

Why the distractors are wrong:

• A (SUSPECTLIST): Suspicious senders receive more scrutiny, not less - RAT checking still applies.
• B (WHITELIST): Whitelisted senders are trusted for spam/reputation purposes but must still send to valid local recipients; the RAT check is not bypassed.
• D (BLACKLIST): Blacklisted senders are rejected outright at connection or MAIL FROM - they never get far enough for RAT bypass to matter.
• E (UNKNOWNLIST): Unknown senders are treated with default policy and still subject to RAT validation.

Memory tip: Think "RELAY = route anywhere" - a relay client is forwarding mail outbound, so checking a table of inbound local recipients makes no sense. The only sender group whose purpose inherently requires skipping the RAT is the one built for relaying.

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