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How can monitoring tools alert you to sudden drops?

Tools establish baseline metrics and alert when current measurements deviate significantly. Sudden drops in delivery rates, reputation scores, or **inbox placement** trigger notifications for immediate investigation.

Alert configurations define: threshold sensitivity (how much deviation triggers alert), metrics monitored (delivery rate, placement rate, reputation score), notification methods (email, SMS, Slack), and escalation rules for persistent problems.

Effective alerting balances sensitivity against noise. Too sensitive generates false alarms; too conservative misses real problems. Configure based on your normal variation patterns and risk tolerance. Test alert flows to ensure notifications reach appropriate people.