spam checks: PTR records, dynamic domain

[bill at horne.net (Bill Horne)]

Tom Metro wrote:
> Bill Horne wrote:
>> The ones I've seen simply screened for the "giveaway" domains that 
>> dynamic-DNS providers provide for free, e.g., "homelinux.org", and 
>> refuse emails from them on the assumption that they would point to a 
>> dynamic IP address if checked.
>
> Ah, so a subdomain. I can see why some admins might do that...
>
>
>> As I said, I have a fixed IP, but I _do_ use billhorne.homelinux.org...
>
> Perhaps inconvenient in the short term, but it seems you could remedy 
> that problem long term for about $10/year by registering your own domain.
>
> I agree that it is short sighted for admins to block all subdomains 
> from dynamic DNS providers, but these days a lot of babies get thrown 
> out with the spam bathwater.

I already have the domain name registered, but that's the easy part. 
While it's only $10/year for the domain name, it's $10/Month for my ISP 
to provide the DNS service, and that's $120/Year that comes in really 
handy at Christmas. Since GoDaddy includes email and web forwarding with 
their basic price, and DynDns has free domains that I can point the 
"real" ones to, I'm getting the equivalent service at a great discount.

But, nothing ever stands still: Sysadmins make assumptions, and I have 
to deal with it. I'm fortunate that I'm a one-person shop and all my 
clients know my phone number, so I can tolerate some missed emails. 
Still, I've raised the question for the benefit of others.

Bill


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