SMS
Postscript agency for ecommerce brands
Postscript is built for Shopify stores, so every subscriber sits next to their order history, checkout activity and site behaviour. Most programs we inspect use it for a popup, a checkout reminder and a promotional blast sent the same day as the email. We treat the phone number as a channel the customer agreed to, build the flows on order and subscription events, and hold sends to what the revenue per message justifies.
Postscript
SMS · by Postscript. A text wordmark, not a logo: we are not affiliated with the vendor and make no claim to its trademarks.
What we do with it
The work inside Postscript
Consent capture that holds up
Popups, keyword opt-ins and checkout collection each need compliant wording, a clear disclosure and a confirmation step where the rules require one. We configure each entry point for the market it serves, keep proof of consent on the subscriber record and make sure a stop request is honoured everywhere the number is stored.
Flows triggered by Shopify events
Postscript listens to checkouts, orders, fulfilments and subscription events. We build abandoned checkout with the cart link, shipping and delivery updates, a post-delivery check-in that leads into a review request, replenishment timed to the product, and win-back for subscribers whose last order is past the category's reorder gap.
Campaigns sent to segments, not the whole list
The segment builder reads order count, products bought, spend and engagement. Launches go to buyers of the related category, restocks to people who viewed the product, and sitewide offers to the group that has shown it responds. Frequency caps stop one subscriber receiving three campaigns in a week.
Two-way conversations and keywords
Replies land in an inbox where the team or a support integration can answer. We set up keywords for the questions customers ask most, route conversations to Gorgias or the helpdesk in use, and make sure a reply never triggers another marketing message.
Working alongside email
Postscript shares subscriber and event data with Klaviyo and similar tools. We decide per flow whether SMS leads, follows or is left out, so a customer who bought after the email does not get the same nudge by text an hour later.
Reporting per message sent
Every send has a cost, so we report revenue per message and per subscriber, not only attributed revenue. Postscript's attribution is reconciled against Shopify orders, and flows that cannot show a return above their message cost are trimmed or moved to email.
When it fits
Postscript is the right tool when
Shopify stores with a repeat purchase pattern
Consumables, beauty, supplements and pet categories give SMS something to say between orders. A one-off purchase catalog has fewer reasons to text.
Brands that already have an engaged email list
SMS grows fastest when it is offered to customers who already trust the brand. A store with a healthy email program has the audience to build a compliant list quickly.
Teams prepared to answer replies
Customers reply to texts. A store with a support process, or a Gorgias connection, gets more from the channel than one that sends and never reads the inbox.
Subscription merchants on Recharge or Shopify Subscriptions
Upcoming charge reminders, skip and swap prompts and failed payment recovery are among the highest-value texts a store can send, and Postscript can trigger on those events.
What to watch
Where accounts drift
Facts about defaults and costs, not criticism. These are the settings we check on every account.
Carrier costs sit on top of the plan
Postscript plans combine a monthly fee with per-message costs that differ for SMS, MMS and destination country. A campaign to the full list at peak is a real expense and should be budgeted like a paid placement.
US registration and Canadian rules
Sending in the United States requires the number to be registered for its traffic type, and Canadian recipients fall under CASL's express consent and identification rules. Quiet hours and sending windows should be set per market before the first campaign.
Attribution windows are Postscript's, not the store's
Purchases are credited to a text when the subscriber buys within the window after clicking or receiving it. Read that number alongside Shopify orders and email attribution so the same order is not counted twice.
List fatigue shows up as opt-outs first
Unsubscribe rate per campaign is the earliest signal that frequency or relevance is off. It belongs on the weekly report, not only in the campaign summary.
How many texts a month is reasonable for an ecommerce list?
Fewer than the store wants to send and more than the flows alone. Transactional and flow messages go out as events happen. Campaigns are usually sustainable at two to four a month for most catalogs, with the opt-out rate per campaign as the check on whether that is too many.
Does Postscript work outside Shopify?
Postscript is built for Shopify and depends on its checkout, order and customer data. A store on WooCommerce or BigCommerce would use a different SMS platform, and we can advise on that choice as part of the retention plan.
Can you run Postscript and Klaviyo together without duplicate messages?
Yes. The integration shares subscriber and event data both ways. We suppress the SMS step in a flow when the email version has already produced a click or an order, and keep consent for each channel separate so one unsubscribe does not remove the other.
What do you need from us to start on Postscript?
Access to the Postscript and Shopify accounts, the current consent language on every form, the list of active flows and campaigns, and the last three months of Shopify orders so we can see how attribution has been reported so far.
How do you measure whether SMS is paying for itself?
Revenue per message sent and per subscriber per month, compared with the message cost and the value of the same customers in email. If a flow or campaign type cannot beat its cost on click-based attribution, it is cut or moved to a cheaper channel.
Works alongside
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