Email Deliverability Test and Spam Rate Optimization Guide

Deliverability Test Overview

The Deliverability Test sends a personalized message to mailboxes outside the warm-up network to determine your inbox placement.

• Provider Selection: Test with relevant B2B (G Suite, MS 365, SMTP) or B2C (Gmail, Outlook, Yahoo, Zoho) providers based on your target audience.

• Deliverability Score (ISP Score): Indicates the likelihood of your emails reaching the inbox based on your last test.

• Credits: Shared across all mailboxes. Each subscription includes at least one test per month.

Auto-Test Configuration

Auto-Test runs automatically once a week for selected domains or mailboxes. Test times are system-determined, but the day is user-selected.

• For Domains: Navigate to the Dashboard, select a domain, click Inbox Placement Test, toggle Auto-Test, and select a day (or use Auto-Pick).

• For Mailboxes: Navigate to the Mailbox tab, select the mailbox, scroll to Auto-Test, and configure the day.

Interpreting Results

• Inbox / Promotions: The message was delivered successfully.

• Spam: The message was routed to the junk folder.

• Unreceived: A sending or tracking error occurred.

• Blacklists: Indicates if your sending IP is listed. If using a shared server (e.g., standard Gmail/Outlook) or a new domain, being listed is common, usually temporary, and rarely requires action.

Action Plan for Test Results

• If results are good: Continue monitoring metrics (open rates, clicks), conduct A/B tests to optimize content, and respect opt-outs to maintain list hygiene.

• If results are bad:

  • Verify SPF, DKIM, and DMARC authentication.

  • Clean your email lists.

  • Use template warm-ups.

  • Process spam complaints and unsubscribes immediately.

  • Check ISP-specific guidelines (e.g., Gmail Postmaster Tools).

High-Volume Sending Insights

• Volume Control: For campaigns exceeding 1,000 emails, pause sending or maintain a strict 1:1 ratio between warm-up emails and campaign emails.

• Strict Filters: Microsoft 365, Outlook, and Yahoo have stringent AI filters. Sending more than 15-20 emails daily to Yahoo can trigger a 24-hour block. Full recovery from low deliverability with these ISPs takes 4-6 weeks.

• Troubleshooting: Monitor bounce emails constantly. Contact support for custom warm-up adjustments targeted at specific strict providers.

Conclusion

Email deliverability requires constant monitoring. If you encounter high bounce rates or need a custom warm-up strategy for strict providers, our support team is ready to help.