291355RE: Null sender address in NDR's
- Feb 14, 2013.
> > Is there a sensible way to configure postfix to allow these messagesI wasn't trying to suggest that sending bounces would be exploitation, rather that allowing *all* messages with a NULL sender to relayed through could potentially be exploited to send spam as <>
> > with null sender addresses to be relayed without opening the smart
> > host up to exploitation?
> Sending bounces is not "exploitation", but the "smart host" (really
> submission service) policy is up to the ISP. Ask them.
> NO. Bounces MUST be sent with a null sender address. Otherwise, bouncesYes I know that and have referred to that point below.
> would elicit bounces in return creating mail loops, sometimes exponentially
> growing, if a message elicits multiple non-delivery reports.
> The solution is to use a relay that permits bounces. Either the ISP relaxesAs I feared, thank you for confirming.
> their policies, or a different relay must be found.
> > And before anyone comments, yes I know this isn't best practice asI understand and agree however in my experience you sometimes have to fudge things so they operate with incorrectly configured systems (against my own wishes!)
> > NDR's should have null sender addresses to stop loops (bouncing
> > bounce-backs!).
> Not "should", MUST. Not "isn't best practice", rather prohibited.
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