A subscription reminder that only says "your box ships soon" wastes the one real chance to influence what's actually in it. MailInApp's Countdown keeps the ship-date deadline accurate on every open, a Poll lets the subscriber pick next month's flavor or variant with one tap, and an optional Product block sells a real add-on — all inside the reminder email.
Most replenishment emails are a formality — a heads-up that a charge is coming, nothing to actually do. The order-lock window before a box ships is a short, real opportunity: customize the pick, add something extra, or just be reminded before the charge lands instead of finding out after.
An order-lock deadline that's never stale
The Countdown block redraws the true time remaining fresh on every single open, computed from the deadline you set — not a fixed image from whenever the reminder was sent. "2 days left to customize" is accurate whether someone opens the email the moment it lands or three days later.
Letting the subscriber actually pick
A Poll block records a one-tap vote for next month's flavor, scent, or variant, straight from the inbox — no separate account portal to log into just to make a preference known. Results roll up per option on your Responses dashboard, so you know what to pack before the order-lock deadline hits, not after.
Selling an add-on without a separate storefront
An optional Product block sells an extra item alongside the regular box — a bonus pack, an upgrade, a one-off extra — with its own Buy now button charging through your own connected Stripe account. A completed add-on purchase rolls into the same orders dashboard as any other MailInApp sale.
Timing it to each subscriber's own cycle
Point a data source at whichever field your subscription platform already tracks — next ship date or order-lock cutoff — and set up a recurring send with a filter like "ships in 3-5 days." MailInApp re-evaluates that filter against your data source's current rows on its own cadence and sends to each subscriber exactly once per cycle, regardless of where they are in their own billing schedule.
Getting started
Add a Countdown block set to the order-lock deadline and a Poll for next month's flavor or variant pick — a Product block is optional for an add-on upsell. Under Contacts & sending, connect your subscription data and set up a recurring send with a "ships in N days" filter so each cycle's reminder goes out on its own.