From: <kr...@gm...> - 2012-11-30 01:19:11
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You can't expect IP used for outbound delivery to also be used for incoming mail - those are defined by MX records under senders domain. Large mail servers hame many mx-es and many mta-smtps for outgoing mail. Similar but more sane idea is SPF, but it also breaks many things like forwarding messages. |