293527Re: Challenges of an internal relay server
- Jun 1, 2013On 05/31/2013 10:53 PM, Jason Price wrote:
With a blacklist in the form of a check_recipient_access map:
Don't do this. Headers are trivially forged, and should never be used to make routing decisions.
/^To: etloc@.../ DISCARD
Even worse; now your users won't know the mail was destroyed.
Since it's all internal, sending them a bounce or reject is perfectly fine.
With an access(5) map, their client will instantly tell them it failed, so they can correct it.
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