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Database checked three times during transaction:
Connect: (Initial connection, before HELO/EHLO)
From: (MAIL FROM:)
To: (RCPT TO:) (with blacklist_recipients)
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Each check may involve several hash lookups
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If relay_hosts_only not on, domains checked
from specific to general; first match (if any) wins
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Connect check can be postponed so that addresses are captured
in logs
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Records without "tags" are checked during all phases
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RELAY is a superset of OK
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DISCARD with To: silently discards message for specific recipient
only
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