0413a5b882
GMX webmail broke after adding <!DOCTYPE html><html><head><body>
wrappers — the Logto SMTP connector sets these as nodemailer's html
field, and GMX's sanitizer chokes on a full document inside its own
page shell. Reverts to bare HTML fragments (the format that worked
before 12:17 commit 484a388) while keeping the extra text paragraphs
added for mail checker text-to-HTML ratio compliance.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>