OT: blocking RFC/best practices violators

Chris Stone cstone at AXINT.NET
Thu Mar 3 01:57:29 GMT 2005

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> 1) I seem to recall a tool on a web page that you could tell it your
> domain and it would tell you what RFC's and bad practices you were
> violating (things like "you don't have a postmaster address at your
> mail server" and "you don't have an MX server for your domain", etc.).
> Anyone know which one I'm talking about?

Some of these are checked at http://www.dnsreport.com

> 2) anyone know of an RBL that is build around that concept?  For
> example, we've got a problem lately with some senders coming from
> domains that are either violating an RFC (no postmaster) or something
> that HAS to be a best practice violation.  Ex: sbcglobel.net (which is
> not sbcglobal.net, a valid ISP) where the domain has an MX record ...
> to a host that evaluates as localhost.  So, bounces and vacation
> replies and such just clutter up our queue for a long while.  It would
> be nice if there was an RBL that had multiple lists/return codes that
> covered different types of problems like this, or places whose contact
> with abuse.net bounces, or they don't have a postmaster address, etc.


> 3) anyone know of an existing milter that covers that example (if
> sender domain has an MX record that gets you to 127.x.y.z, then reject
> the message)?

milter-sender will does quite nicely -


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