Date: Mon, 01 Jun 1998 14:57:40 -0700 From: Studded <Studded@san.rr.com> To: Leif Neland <root@internet.dk> Cc: leifn@internet.dk, questions@FreeBSD.ORG Subject: Re: perl, MX lookup Message-ID: <357323D4.FE221A2E@san.rr.com> References: <Pine.BSF.3.96.980601231752.283A-100000@darla.swimsuit.internet.dk>
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Leif Neland wrote:
>
> On Sun, 31 May 1998, Studded wrote:
>
> > Leif Neland wrote:
> > >
> > > In a perlscript, I can use gethostbyname to check if a given host exists.
> > >
> > > But how can I check if there exists a MX-record for a given host?
> > > I probably could system("host -t MX $host"), but I'd rather have a
> > > "native" perl solution.
> > >
> > > (I want to check in a script if an email-adress contains a valid hostpart)
> >
> > Keep in mind that the abscence of an MX record doesn't make a hostname
> > an invalid delivery address. The default (which is quite servicable in
> > most cases) is to attempt delivery to the A address.
>
> Yep. But my attempt with gethostbyname required the host-part of the
> email-adress to have an IP-adress. It worked with the adresses I tested,
> but then my boss tested with his own domain, which only had an MX, so my
> test failed. Bummer...
*Nod* That's a slightly different problem. The Net::DNS perl module
has what you need though, there is a port in /usr/ports/net/p5-Net-DNS.
I'm sure you're aware of course that you want to do the hostname lookup
on the host returned as an MX record too since an MX without an A might
be a way to avoid spam-detection.
Good luck,
Doug
PS, you might want to publish that script here when it's done, it might
help save someone else going through what you had to. :)
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