From: Simon White (no email)
Date: Fri Nov 01 2002 - 12:26:57 EST
01-Nov-02 at 18:24, Marc Owen () wrote :
> On Fri, 1 Nov 2002 16:17:09 +0000
> Simon White <> wrote:
>
> > 01-Nov-02 at 11:04, Wietse Venema () wrote :
> > > Simon White:
> > > > Therefore, a small but significant amount of SMTP services are not
> > > > doing DNS lookups properly, or have broken DNS lookup libraries, or
> > > > similar.
> > >
> > > Such as?
> >
> > I don't know, perhaps those people who have been having the problems may
> > have some information on that. I cannot fathom why any mail would use an
> > A record to send email to a domain when an MX record exists...
> >
>
> I wouldn't know either. The MTA's those hosts that ignore mx-records are
> running (Qmail, M$ Exchange, ...), are too common to make this kind of
> mistake. I suppose the software that sends those mails, connects to
> mailhosts directly instead of delivering locally or to a relay/smarthost.
> So yes, it's probably spamware in most cases, and then in that case it's
> only a good thing that the mail gets refused. Stupid programs.
>
> But in some cases it could be legitimate mail, maybe from some
> sucky webmail implementations. The best way to find out is to accept the
> mail and copy it to myself for investigation, but I don't really want to
> spend all my time working around other people's mistakes - by experience I
> know that such mistakes and lack of response or unhelpfulness of admins go
> together.
>
> Michael Breton's idea of running a simple http client is not bad, but the
> recent problems with apache/openssl/... have made me (even more)
> suspicious, and I don't feel like sacrificing some security for such a
> stupid reason. Mailservers should be secure, it's just too important.
>
> I think I'll just keep on refusing them. I suppose the (legitimate)
> senders will notice pretty fast that their mail-solution sucks when a
> large percentage of their email comes back, while if I work around it, the
> problems continue to exist. There's no point in complying with something
> _that_ broken.
Good solution... DNS MX records are there for mail. Anything else has
nothing to do with mail, and I for one will *not* put in workarounds for
people who do not comply with simple DNS MX records.
-- [Simon White. vim/mutt. . GIMPS:74.77% see www.mersenne.org] UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity. -- Dennis Ritchie [Linux user #170823 http://counter.li.org. Home cooked signature rotator.] - To unsubscribe, send mail to with content (not subject): unsubscribe postfix-users
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