Send window
Email & SMS deliveryAlso called: quiet hours, sending window, business hours sending
A send window restricts the days and hours during which an automation may send, holding messages that come due outside it until the next open slot — so a sequence started at midnight does not text anybody at midnight.
Any automation with waits in it will eventually try to send at an awful time. Somebody enrols at 23:40, the wait is twenty minutes, and the tool does exactly what it was told.
For SMS this is not merely rude. Many jurisdictions regulate messaging hours, and a 3am text is the kind of complaint that costs a sending number rather than a subscriber.
Timezone choice is the part worth deciding deliberately. A window in your company's timezone is predictable for your team; a window in the contact's timezone is correct for the contact. International lists want the latter, and want a stored timezone to make it possible.
How it works in FrazzleCRM
- ✓The send window is a per-automation setting: days of the week, a start and end time, and whether it is evaluated in the company timezone or the contact's.
- ✓Email and SMS that come due outside the window are queued to the next open slot rather than dropped.
- ✓Internal notifications to teammates deliberately ignore the window — an alert about a hot lead is not a marketing message.
- ✓Individual duration waits can additionally carry their own window, so one step can be constrained without constraining the whole flow.
Where teams get this wrong
A narrow window plus a large batch produces a queue, and the queue drains into the next opening all at once. Widen the window or slow the entry with drip mode; do not discover the interaction on a Monday morning.
Common questions
Does a send window delay the whole automation?
It delays sending. The run continues to move through non-sending steps; messages that fall outside the window wait for the next open slot.
Company timezone or contact timezone?
Contact timezone if you have reliable timezone data and an international list. Company timezone if you do not, because a wrong contact timezone is worse than a consistent company one.
See it on a real map
Free templates where this shows up as an actual node. Clone one and the diagram runs as the automation.
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Related terms
Wait step
A wait step pauses a contact's run inside an automation until a condition is met — a duration elapsing, a clock time arriving, a date field coming due, an appointment approaching, or an event happening — then continues from where it left off.
Drip campaign
A drip campaign delivers a pre-written series of messages on a fixed schedule after a contact enters it, so everyone receives the same messages in the same order relative to their own start date rather than on a shared calendar date.
Do Not Disturb (DND)
Do Not Disturb is a per-contact, per-channel mute that suppresses outbound email, SMS or calls to that contact without deleting them or removing them from your CRM.
A2P 10DLC
A2P 10DLC is the US carrier framework for application-to-person messaging sent from ordinary ten-digit long code numbers. Senders register their business and campaign with the carriers, and unregistered traffic is throttled or filtered rather than delivered.
Or browse all 24 terms — grouped by what part of the funnel they belong to.
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