Salesforce Daily Email Limit refers to the 24-hour sending cap of 5,000 mass emails per organization. "Daily" means a rolling 24-hour window based on your organization's time zone, not a calendar day that resets at midnight. This shared limit applies to all mass email functionality across your entire Salesforce instance.
Rolling Window Mechanics
The daily limit operates continuously rather than resetting at midnight. An email sent on Tuesday at 2 PM counts against capacity until Wednesday at 2 PM. As older emails roll outside the 24-hour window, capacity becomes available again—but this makes planning difficult without sophisticated tracking.
No carryover exists. If you send only 1,000 emails on Monday, you don't get 9,000 on Tuesday. Each day provides exactly 5,000 capacity, use it or lose it.
Primary Constraints
Burst sending becomes impossible. Product launches requiring simultaneous notification to 15,000 customers must stretch across three days minimum. By day three, early recipients have shared information publicly, competitors have responded, and social media is discussing it—while you're still sending the original announcement.
Daily coordination overhead increases. Teams must communicate constantly about who's sending what, when. Global organizations face timezone complications—international teams sending during US overnight hours consume capacity before US teams start work.
Working Within Constraints
Reserve specific capacity for different functions. Sales gets 2,000 daily, marketing gets 2,500, and customer success gets 500. This prevents monopolization and provides planning predictability, though it reduces flexibility.
Distribute sends throughout the day rather than concentrating in the morning hours. Spreading 5,000 emails from 8 AM to 5 PM (555 per hour) maximizes utilization and prevents afternoon lockouts.
MassMailer removes daily ceilings entirely. Send 5,000, 50,000, or 500,000 emails daily without artificial constraints or multi-day campaign fragmentation.
