Re: [courier-users] Selectively allowing illegal domains?

Lloyd Zusman wrote:
> I'm using the BOFHCHECKDNS="1" setting in the esmptd configuration file
> to automatically reject email from domains that cannot be verified by
> DNS.
>
> However, is there a way to configure courier to automatically reject
> mail from most illegal domains, but to allow it to come through from
> a small, preconfigured set of non-existent domains?
>
> I want to send mail to my personal address from servers at work that
> are behind their firewall. All outgoing email from those servers gets
> an internal, work-specific domain name appended to the address, and that
> name is not known to the outside world. Therefore, the mail is rejected
> by my my courier server where my personal address lives.
>
> The probability that I can get the IT people at work to change their
> mail software to accomodate my desires is pretty much zip. Therefore,
> I'd like to be able to tell courier that this small handful of
> internally known domain names from work be treated as being legal, even
> though the DNS test fails for them in the "outside world" ... and that
> all other mail from illegal domains still gets rejected.

What DNS is the Courier Server using? If it's under your control you
could make the domain names legal by setting up DNS zones for the
illegal domains. If you're not already using your own DNS server,
install BIND on your Courier server and have the server use itself for
DNS lookups (BIND itself can forward most lookups to your ISP or
whoevers DNS servers while responding authoritatively for the "illegal"
domains). If you go this route, I recommend you using something like
webmin (http://www.webmin.com) to configure BIND, makes it a lot easier.

Another possiblitity is getting the Courier server to use the same DNS
servers your internal work network uses that has details about the
illegal domains.

Jay
--
Jay Lee
Network / Systems Administrator
Information Technology Dept.
Philadelphia Biblical University
--


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