Frequency capping is a rule that limits how many emails a single subscriber can receive within a defined time period, regardless of how many separate campaigns or automations are technically eligible to reach them.
Solving a Problem Email Frequency Alone Can't
What is frequency capping addressing that overall email frequency planning misses: the collision problem. A store might have a perfectly reasonable broadcast calendar and perfectly reasonable automation triggers individually, but a single subscriber can still end up receiving a welcome email, a browse abandonment follow-up, and a scheduled newsletter all within the same 24 hours, purely because multiple systems triggered independently without awareness of each other.
Frequency capping vs email frequency is the difference between planning overall volume in the abstract and actually enforcing a ceiling at the individual subscriber level, catching the overlaps a calendar-level plan can’t see.
How a Frequency Cap Actually Functions
An email frequency cap typically works as a rule layered across every campaign and automation simultaneously: no more than, for example, two marketing emails per subscriber per 48-hour window, regardless of source.
When a new email would push a subscriber over that limit, the platform either delays it or drops it from that specific batch, prioritizing based on rules the sender defines, usually favoring time-sensitive triggered emails like an abandoned cart reminder over a less urgent broadcast.
Where This Becomes Essential Rather Than Optional
Frequency capping examples matter most for stores running many simultaneous automations, all potentially eligible to trigger for the same subscriber around the same time:
- Welcome series
- Abandoned cart
- Browse abandonment
- Post-purchase
- Win-back
Without a cap, a subscriber who abandons a cart during an active broadcast campaign could receive three or four emails in a single day purely by coincidence of timing, which reads as noise regardless of how relevant each individual email was on its own.
Deciding What Gets Priority When a Cap Is Hit
The harder design decision isn’t whether to cap frequency, it’s what happens when a cap is actually reached and multiple emails are competing for the same limited slot. Most well-built systems prioritize by urgency and relevance rather than simply sending whichever email was queued first: a time-sensitive triggered email, like an abandoned cart reminder tied to inventory that might sell out, usually outranks a general newsletter that has no real expiration.
Getting this priority order wrong, letting a routine broadcast crowd out a genuinely time-sensitive automated email, defeats much of the purpose of capping frequency in the first place.
Related terms:
Adflipr’s automation workflows can be configured with frequency limits, helping stores avoid overlapping sends across multiple automations and campaigns.
