Pre-Flight Campaign Deliverability Tester
Inbox Placement & Spam Score Tester
Stop guessing if your email blast will make it. Test your sender domain, subject line, and copy against modern filtering algorithms at Google, Microsoft, Yahoo, and Apple.
How Does Inbox Placement Testing Work?
Modern inbox providers (Gmail, Outlook 365, Yahoo, Apple Mail) use complex machine learning classifiers to determine whether an incoming email lands in the Primary Inbox, Promotions Tab, or Spam Folder. They look at 4 critical criteria:
- Authentication Alignment: Valid SPF, DKIM (2048-bit), and DMARC passing with zero alignment errors.
- Content & Spam Words: Trigger keywords (e.g. "guaranteed", "urgent", "100% free") that flag Bayesian heuristic filters.
- RFC 8058 One-Click Unsubscribe: Mandated by Google & Yahoo since 2024 for all marketing broadcasts.
- HTML Payload Formatting: Avoiding raw email sizes over 102KB which triggers Gmail clipping and breaks tracking pixels.
Need Automated Multi-Mailbox Seed List Testing?
Emailsendy Delivery Center Plus provides automated testing against 50+ real monitored mailboxes with screenshot previews and Google Postmaster integration.