[conspire] (forw) [sorbs.net #212641] [Webform] SORBS registration systems sends RFC-ignorant mail

Ruben Safir ruben at mrbrklyn.com
Mon Oct 27 11:44:09 PDT 2008

On Mon, Oct 27, 2008 at 11:33:43AM -0700, Rick Moen wrote:
> Quoting Ruben Safir (ruben at mrbrklyn.com):
> > I used to have a sendmail configuration like that and nearly all ny
> > Linux friends couldn't send my mail because they didn't control their
> > DNS (or IP addresses)

But you can't reverse DNS check if the sending machine is behind a
firewall/port forwarding or their dns name myhost.yahoo.com isn't an
official host of yahoo.com

that has been the problem historically.


> None of the RFCs in question (defining SMTP) require controlling one's
> own IP or DNS for compliance.  It's a matter of MTA configuration -- and
> to my knowledge all common MTAs have defaulted to support for those
> standards for quite a long time.  
> Of course, there are sites (including virtual-hosting sites and such)
> that either prevent RFC-compliance or make it non-default.  For example,
> BALUG's mail-hosting at Dreamhost refused incoming mail to
> postmaster at balug.org for several years, and the gentleman (Michael
> Hubbard) who arranged that hosting as a Dreamhost customer asserted that
> it was impossible to make Dreamhost-hosted domains accept postmaster
> mail.  It turned out, he was incorrect:  He simply hadn't bothered to
> configure his Dreamhost account settings to enable that mailbox.
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