Which of the following two RAT entries will accept mail for example.com and all of its sub- domains? (Choose two.)

Question

Options

• A*@example.com
• B.example.com
• Cexample.com
• D@.example.com

• A
  7% (3)
• B
  76% (32)
• D
  17% (7)

Explanation

In a Recipient Access Table (RAT), example.com (C) matches the domain itself exactly, while .example.com (B) matches all subdomains such as mail.example.com or sub.example.com - together, they cover the full requirement of the domain and all its subdomains.

Option A (*@example.com) is wrong because it uses address-level wildcard syntax targeting users at the domain, not a domain-level entry - RAT domain entries don't use the @ format for this purpose. Option D (*@*.example.com) similarly misuses @ syntax and would only attempt to match subdomains, missing example.com itself entirely, while also being invalid syntax in most RAT implementations.

Memory tip: Think of the leading dot in .example.com as "dot = deeper" - it goes below the domain to subdomains, so you always need the plain example.com entry alongside it to catch the top-level domain too. If you see @ in a RAT choice, it's targeting a specific address format, not a domain match.

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