[cobalt-users] Reverse lookup/email server problem

[Josh Endries <jendries@xxxxxxxxxxxx>]

Hiya all,

I'm looking through the archive but not finding anything particularly 
useful. I'm having a problem with reverse IP lookups. I started seeing 
messages like this from one remote server (aka not mine) within the last 
few days:

stat=Deferred: 451-Reverse lookup for <my-ip> is currently unavailable, 
this could be a...

Any ideas? I know why one would want to check DNS in both directions, 
but I'm confused about how this would work when you use virtual hosts. 
I'm not a DNS guru, but if I have "mail.site1.com" and "mail.site2.com" 
on my raq, and another server reverses my IP, does it return a list of 
all the domains? The first one? Random? Does it even matter (maybe 
something else is wrong)? I would think that, if a program reversed 
1.2.3.4 expecting host.domain.com (vhosted) and got something else 
(server name), the program would reject that.

I just read one post that mentioned getting the IP block provider to set 
up the reverse, which makes sense. A dial-up user can't set up a "legal" 
reverse, and this is a similar situation. What should I point it to, the 
name of the raq itself? Okay, well I'm going to look into this, but my 
questions about vhosting and reverse lookups are still out there. :)

Thanks

--
Josh