feat: MX record fallback in account auto-discovery
When JMAP well-known and autoconfig XML both fail, query DNS-over-HTTPS (dns.google) for MX records and use the highest-priority MX host as IMAP (993/SSL) and SMTP (587/STARTTLS) server. No new dependencies needed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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