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SMS send cap vs the rebill reminder cohort

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CalculatorSMS cap vs rebill cohort · Calculator lives in the articleOpen

SMS platforms enforce a daily send cap. CRM rebill reminders need one message per profile before the MIT day. If cohort × 1 exceeds cap × days left, the rest never leave. Type daily cap, cohort size, and days until rebill.

Pair: SMS cap vs rebill cohort on Subscriptions. Keyword ≠ cancel: STOP vs MIT. Suppress vs CRM active: suppress vs CRM.

What you type

Daily SMS cap — platform max sends per day for this brand / short code (the written cap, not yesterday’s send count).

Rebill cohort — CRM profiles you intend to remind before the next MIT (same window).

Days until rebill — calendar days left before that wave’s charge day.

Capacity = cap × days. Unsent = max(0, cohort − capacity). Cover days = cohort ÷ cap. Raise the cap or shrink the wave — do not invent a “typical open rate” to paper the hole.

What not to do

Do not treat STOP keyword volume as the send-cap job. Do not invent deliverability to shrink the unsent count. Do not count email capacity in the SMS cap. Do not mix winback flows that are not tied to this rebill day into the cohort.

Related: Subscriptions, STOP vs MIT, suppress vs CRM, dunning email vs auth.

Procedure

  1. Type the written daily SMS cap.
  2. Type the CRM rebill reminder cohort.
  3. Type days until the charge wave. Read unsent count.

Failure modes

  • Inventing deliverability to shrink the unsent count.
  • Treating STOP keyword volume as the send-cap job.
  • Counting email capacity in the SMS cap.

Worked example

None on this page yet. When one lands it will be a real case: what broke, the number, and what changed. Not a composite.

Glossary

SMS cap unsent
Cohort size minus (daily cap × days left). Profiles that cannot receive a reminder before the MIT day at this cap.

Work with us — We run this job on your accounts. Services

FAQ

Is STOP the same as cancel?
No. [STOP vs MIT](/manuals/sms-stop-vs-mit) is keyword vs vault. This page is whether your send cap can reach the rebill cohort before the charge day.
What deliverability should I assume?
None. Type the platform daily cap and the CRM cohort size. We invent no open or click rate.
Can I invent a healthy unsent count?
No. Unsent is cohort minus capacity. Zero means the cap covers the wave.