>I have been playing with my Declude settings only to realize my own reverse
>DNS was not configured. My DNS provider told me that he can't provide
>reverse DNS: in order to provide a reverse lookup, the nameservers have to
>have a
>delegation for the entire netblock that IP address resides in.
>Thus, my ISP has provided reverse DNS for my domain.
That's all correct; your ISP is the one that has to either host the reverse
DNS entry, or delegate authority for it to your DNS servers.
>But, there can only be one reverse DNS entry per IP address, so how do I
>enable reverse DNS for my
>virtual domain customers?
All you need is a single reverse DNS entry. Technically, you can have
more, but very few programs (if any) can handle more than one reverse DNS
entry.
There should be no problem sending mail from virtual.example.com even
though the reverse DNS entry is mail.example.com. Just so long as a
reverse DNS entry exists, there should be no problem. If a remote host
doesn't like "virtual.example.com" in this case, it will just check to see
if it has an MX/A record.
-Scott
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