• relaying: forwarding mail not bound for you
• default: deny foreign relaying, hasn't always been that way!
• FEATURE(`accept_unresolveable_domains') dnl do not use this
• FEATURE(`access_db')' dnl /etc/mail/access control
• makemap hash /etc/mail/access.db < /etc/mail/access
• realtime blackhole list: FEATURE(`dnsbl')
• header analysis
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