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Off the top of my head: Don't emit backscatter. Don't allow spam to be sent out. Have matching A and PTR RRs in place. Create SPF records. Sign outgoing mail us
by jlgaddis 12y ago
Off the top of my head: Don't emit backscatter. Don't allow spam to be sent out. Have matching A and PTR RRs in place. Create SPF records. Sign outgoing mail using DKIM. Make sure you accept mail for abuse@ and postmaster@.