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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Mailserver requirements
On Tue 06 Apr 2004 (00:55 +0200), Daniel Roesen wrote: > > On Mon, Apr 05, 2004 at 11:53:15PM +0200, Arnold Nipper wrote: > > >>of course this server does have a reverse mapping. But this reverse > > >>mapped doamin does not have an MX record. > > > > > > Does it have an A RR? > > > > It also does have an A RR. And the forward mapping does also match the > > IP address. > > OK, so the check is even broken in what it probably tries to verify... > that the reverse-domain of the sender IP would (possibly) be able to > receive mail (bounces). Why would bounces go to an outbound mail server? They go to the envelope sender, which might well be in a different domain. The check is simply ill-advised and will cause the system running such a check to have cut itself off from a large number of legitimate sources of email > > > Anyway... it's a heuristic which definately does give false positives. > > > The only requirement is that IF a domain/host accepts mail there MUST be > > > a [email protected] address. > > > > In this case the host *sends* mail ... > > Sure. I was discussing the requirements for domains regarding email. > > In this specific case, "domain" being the domain of the PTR of the > sending MTA host. If you are sending mail via a virtual ISP, then the 'real' ISP's mail servers will probably be in a different domain than your virtual ISP which might be a different domain than your account. Checking mail reachability of an outbound MTA is simply absurd. -- Jim Segrave [email protected]
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