Email glossary · Practical guide
Sending window: when a due message is allowed to run
A sending window defines allowed campaign times. A message can be due but still wait because the current time is outside that window or another eligibility gate blocks it.
Reviewed · Examples are illustrative
Who this helps: Readers checking a term before making an outreach or mailbox decision.
Meaning and common confusion
The window is interpreted in a configured timezone. It is not the same as a fixed delay from the previous message, and it does not reserve capacity. A correct diagnosis compares the due timestamp, allowed day and hour, timezone and available budget.
Worked example
This is a synthetic illustration, not a customer result or a live configuration to copy.
Follow-up becomes due on an excluded day
Next allowed window starts later
Observed wait: consistent with configuration
Separate question: whether sender and budget will also be eligible when the window opens.Checks to make
- Use the campaign's configured timezone.
- Review excluded days and daylight-saving changes.
- Keep queue status separate from scheduled eligibility.
Next step and limits
Use the sending-window and timezone guide before changing a delay. Do not promise an exact send time from the window alone. Zintara still applies sender, contact and budget controls when evaluating pending work.
Source: Zintara product context for this operational definition
Source references
Worked examples are illustrative. Editorial procedures are suggested methods, not measured performance claims or promises of additional product features.
Related guides
- Campaign sending windows and timezones: audit the clock that matters →
- Daylight saving and email campaigns: review the transition week →