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74.125.235.55is a domain (per RFC 5322 § 3.4.1 it's not the syntax of an IP address in anaddr-spec). It's a nonexistent domain, but it is a domain, much to the annoyance of several content DNS server operators. Note also that several MTSes will automatically accept mail addressed to their SMTP Relay servers' IP addresses (in the syntactically correct manner). Older versions of exim did this. So does qmail.addr-specthe sequence of characters74.125.235.55is a domain, with the labels55,235,125, and74in descending order from the root. In 2008, Duane Wessels et al. put such nonexistent domain names as causing some 3.8% of the queries at ICANN's "K" root content DNS server. It's now time for you to read RFC 4697 § 2.9. ☺