Analyze an email address

Runs one email address through the pipeline and returns a single record describing it: its parts (local, username, tag, domain), the top-level domain and the country that administers it, what's known about the domain (mail provider, category, live MX records, SPF and DMARC policy, registration dates), whether it has a Gravatar, a did_you_mean correction for likely typos, and boolean attributes such as is_free, is_disposable, is_forwarder, and is_likely_role_based. The address is read from email, or from q as an alias, and one of the two is required; a request naming neither is rejected with a 400 (email_intelligence.email_missing). A malformed address is not an error: it answers 200 with attributes.is_valid_syntax false and no lookups run. Every response carries the same shape, and a value the data can't name comes back null. Omitting a branch with response_fields_omit also skips the lookup behind it (for example gravatar or domain.registration), which makes the request faster. See https://restcountries.com/docs/email-intelligence for the full reference.