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# srv-a is forbidden from sending mail.

# srv-a zone
srv-a A    127.0.0.1
srv-a AAAA ::1
srv-a MX   srv-a
srv-a TXT  v=spf1 -all

# srv-b zone
srv-b A    127.0.0.1
srv-b AAAA ::1
srv-b MX   srv-b
srv-b TXT  v=spf1 a