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Comment: Typo.

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A: Third, if your email gateway is behind a firewall make sure that SpamAssassin is resolving the gateway to it's its external address. If SpamAssassin resolves the gateway to an private IP or can't resolve the name at all, it may mark the sending system as a trusted relay. As a result, some or all of the spammer's systems will not be checked against the DNSBL. (I'm not aware of anyway to specify 'last trusted relay' in SA).

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