On Tue, Apr 24, 2001 at 02:33:18PM -0700, Szii wrote:
> Checking to see if it's "syntactically correct" is trivial. Validating the
> domain is rather simple as well (check the retcode on a whois lookup.)
Which is not as trivial as it sounds, since whois does not really have "return-codes".
You need to know in advance how this particular whois-server is responding. (since
most whois-server just serve a few TLD you might not even use only one whois-server).
Even the output of a general whois-server like whois.thur.de (you can query pretty much
everything on it) differs from TLD to TLD (since all whois.thur.de is, is asking the
actual
whois-server for that TLD.)
It's probably much easier for validating a domain to use the mx-record-function.
> Again, it's not "real-time" validation of anything except the
> existance/validity of the domain - not the user.
If your php-scripts looksup the mx-record for the domain and delivers directly
to the mx for the domain, you might be able to verify in real-time, since
you will get the return-codes of the mx. However not all mx'es deliver locally.
As soon, as the mx passes the mail onto a different host for delivery (and there
quiet a few of these around...) you can't verify.
So basically, yes, you can lookup the domain, verify that the domain as a valid
mx, but that's pretty much it.
-fkr
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