Short data retention on lower-tier plans complicates debugging
6/10 MediumFree and Pro plans only retain email data for 1 and 3 days respectively, making it difficult to diagnose deliverability issues or identify longer-term trends without upgrading or implementing custom logging infrastructure.
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Collection History
Only one user is supported, which makes this impractical for teams. Data retention is limited to 30 days. You don't get advanced features like metric alerts, custom dashboards, or cross-project issue correlation. The 5,000 error limit sounds generous until you hit a bug that triggers a cascade of repeated errors, which can burn through your monthly quota in hours.
The biggest drawback I noticed is data retention on lower-tier plans. With just 1 day on Free and 3 days on Pro, historical data disappears quickly, which can make diagnosing deliverability issues or spotting longer-term trends more challenging.