Amazon buyer messages are a different sport from other marketplaces: the volume is lower (Amazon answers most WISMO itself), but the stakes per message are higher, because response time is measured and messaging is policy-fenced. Here is how the system actually works from the seller's side, and how to run it without tripping the wires.

Where the messages live

Buyer messages arrive in the Buyer-Seller Messaging Service, which you work from the Message Center in Seller Central (and its mobile app). Every message between you and a buyer flows through Amazon's relay: the buyer sees an anonymized address, Amazon keeps the record, and that record is what protects you in an A-to-z claim. Which leads to rule zero: keep every conversation inside the Message Center. Off-Amazon contact is both against policy and evidence you cannot use.

The 24-hour rule (yes, including weekends)

Amazon expects buyer messages answered within 24 hours, and it measures you on it. That includes weekends and holidays. Slow responses feed into your customer service performance, and consistently slow sellers feel it in account health.

Two pressure valves exist:

Mark as no response needed: messages that genuinely need no reply (a buyer saying "thanks!") can be marked as not needing one, which stops the clock without a send.
Away status: Seller Central has a vacation/away setting for messaging, but it manages expectations rather than pausing obligations; order-related problems still need handling.

The honest math: a one-person shop that answers twice a day, morning and evening, stays comfortably inside the window. The sellers who get burned are the ones who batch messages weekly.

What you may and may not send

Amazon's messaging policy is stricter than eBay's, and it is enforced. The short version:

Permitted: anything needed to complete the order or respond to a buyer's question: shipping clarifications, customization questions, return instructions, invoice requests.

Not permitted: marketing of any kind, links off Amazon, asking for positive reviews (a neutral "please share product feedback" via the official Request a Review button is the sanctioned route), incentives, and repeated review reminders. Amazon also normalizes formatting; decorate less, inform more.

The practical takeaway: every proactive message should exist for the buyer's benefit, not yours. If a message would read as marketing to a skeptical reviewer, it is.

Templates for the messages sellers actually get

The customization/spec question:

Hi, thanks for the question. To answer directly: [exact answer]. You can see this in the listing under [section]. If you want, tell me how you plan to use it and I will confirm it fits before you order.

Where is my order (seller-fulfilled):

Hi [name], your order shipped on [date] via [carrier], tracking [number], with delivery estimated [range]. As of today it is in [location] and on schedule. If it has not arrived by [date], message me here and I will make it right.

The return request conversation:

Hi [name], no problem at all. Your return is authorized through your Orders page; the label is available there. Once it arrives back and checks out, the refund goes to your original payment method. If something was wrong with the item rather than a change of mind, tell me what happened, because I want to fix that at the source.

The angry message that wants to become an A-to-z claim:

Hi [name], I am sorry this has been frustrating, and I want to resolve it here and quickly. Here is what I can do today: [concrete fix with date]. If that works, reply and I will start immediately.

The pattern, as everywhere in seller messaging: the specific facts of the order, a concrete action, and a date. Amazon buyers are trained by Amazon itself to expect precision.

FBA vs FBM changes the job

If you are FBA, Amazon handles most delivery and return conversations, and your inbox skews toward product questions, which are really conversion opportunities: a fast, specific answer often is the sale. If you fulfill yourself (FBM), you own the whole conversation surface, WISMO included, and the 24-hour rhythm matters proportionally more.

The meta-skill

The Amazon inbox rewards exactly one thing: fast, factual, policy-clean replies. That is a systems problem more than a writing problem, which is why we are building Reply Copilot for Amazon: the same AI drafting that works inside eBay Seller Hub today, adapted to Buyer-Seller Messages and the 24-hour window. It is in active development; the Amazon waitlist gets exactly one email on launch day. Until then, Reply Copilot is live for eBay sellers.

FAQ

How fast do I have to answer Amazon buyer messages? Within 24 hours of receipt, weekends and holidays included. Messages that need no reply can be marked as such, which satisfies the requirement without a send.

Can I ask Amazon buyers for a review in a message? Not for a positive review, and not with incentives. The sanctioned route is the Request a Review button, which sends Amazon's own neutral template. Messaging policy violations here are a common suspension trigger.

Can I send a buyer a link or my website? No. Off-Amazon links, marketing content, and attempts to move the conversation off-platform violate messaging policy.

Do FBA sellers need to answer buyer messages? Yes, the 24-hour expectation still applies, though FBA routes most delivery and return issues to Amazon's own support, so FBA inboxes are mostly product questions.

Selling on eBay too? The same playbook, deeper: 12 eBay message templates and the item-not-received guide.