> While true, how can I pragmatically determine the registrar during the SMTP > session in a way that scales?
Well, in theory and at least for the new gTLDs: % whois -h whois.nic.<tld> <domain name> | grep -i "registrar:" although % whois -h whois.nic.<tld> <domain name> | grep -i "registrar iana id:" is probably a bit better as you wouldn't have to deal with the registrar's name. (the whois server and the registrar in the whois output is contractually required by ICANN). Of course, this won't work in practice because registries will rate limit queries and I imagine any SMTP server of any significant size will hit those limits quickly. Of course, if the behavior on a timeout was to reject, registries might be incentivized to modify the rate limiting logic... Regards, -drc (speaking only for myself)
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