How each provider treats you
Gmail, Microsoft, Yahoo, Apple - each has different filtering logic, throttling behavior, and engagement patterns. What works for one might fail for another. Engagor gives you provider-by-provider visibility into your delivery performance.
Per-ISP metrics. Throttling detection. Trend comparison.
Full visibility per provider
For each ISP, Engagor tracks delivery rate, bounce breakdown, complaint rate, engagement metrics, and deferral patterns. Compare providers side-by-side.
Delivery
- Delivery rate
- Hard bounce rate
- Soft bounce rate
- Deferral rate
Risk
- Complaint rate
- Spam trap signals
- Blocklist presence
- Risk score
Engagement
- Open rate
- Click rate
- CTOR
- Unsubscribe rate
Trends
- 7-day trend
- 30-day trend
- vs baseline
- Anomaly flags
Know when you're being slowed
ISPs don't always reject - sometimes they throttle. Deferrals pile up, delivery slows, but nothing bounces. Engagor detects throttling patterns by monitoring deferral rates, delivery delays, and SMTP response patterns.
When Microsoft starts returning "try again later" at elevated rates, you'll know - and you'll know whether to reduce velocity or wait it out.
Delivery Delay
Average time from send to delivery per ISP
Deferral Rate
Percentage of emails deferred vs delivered
Pattern Analysis
SMTP responses indicating rate limiting
Reduce Microsoft volume by 20% for next 4-6 hours
Side-by-side analysis
Compare any two providers head-to-head. See where you perform better, where you struggle, and identify provider-specific optimizations.
Insight: Gmail significantly outperforms Microsoft across all metrics. Microsoft's elevated deferral rate (2.8% vs 0.3%) suggests throttling - consider reducing Microsoft volume or spreading sends over longer windows.
What each ISP cares about
Gmail
Authentication-focused
- Strict on SPF/DKIM/DMARC
- Engagement-weighted filtering
- Domain reputation over IP
- Tabs affect visibility
Microsoft
Throttling-heavy
- Aggressive rate limiting
- IP reputation sensitive
- Junk folder over reject
- SNDS data available
Yahoo
Content-sensitive
- Content filtering aggressive
- Complaint-loop integrated
- Postmaster tools available
- Shared with AOL
Apple
Privacy-first
- Mail Privacy Protection
- Open tracking affected
- Less aggressive filtering
- Growing market share
Ready for per-provider visibility?
See how ISP-level analytics can help you optimize for each mailbox provider.