Ruby 查询域名的 MX 记录

2015/12/14 59757

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require 'resolv'
 
Resolv::DNS.open do |dns|
  mail_servers = dns.getresources("google.com", Resolv::DNS::Resource::IN::MX)
  mail_servers.each do |server|
    puts "#{server.exchange.to_s} - #{server.preference}"
  end
end