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Reseller guides and comparisons

Guides, comparisons and engineering notes on reselling phone numbers, domains and mailbox licences. Every figure links to its source.

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Latest, Guides

Holding a domain portfolio: renewals, status codes and the names that attack yours

Holding more than a few domains means missed renewals, EPP status codes on failed transfers, and lookalike names registered against your brand.

15 October 202611 min read

Read the guide

In this article

A portfolio is a list, not one domain
How early to renew, and what a renewal or transfer actually costs
EPP status codes, read when a transfer fails
Choosing a name worth holding
A domain's age and who holds it, read quickly

Earlier articles

15 October 2026Guides
How SPF, DKIM and DMARC work together, and what to do when one fails
SPF checks who may send, DKIM checks the message was not altered, and DMARC ties the two together and tells a receiver what to do on failure. Fix SPF first, then DKIM by provider, then move DMARC to enforcement.
9 min read
15 October 2026Guides
Pricing what you resell: cost, markup, margin and the invoice at the end of it
Pricing what you resell as eight sums: one sale's margin, Workspace vs 365 seat cost, break-even, MRR/ARR and lifetime value, each by free calculator.
8 min read
15 October 2026Guides
Sending SMS that arrives: segments, sender names and A2P registration
An SMS fails for one of three reasons: too many segments, a blocked sender name, or no A2P 10DLC registration. One guide, with a calculator for each.
12 min read
15 October 2026Guides
The DNS records a domain needs, and what each one actually does
A domain's own DNS mostly comes down to five record types: TXT, MX, CNAME, CAA, and the NS/SOA pair every zone carries. This guide explains what each one does, with a live checker for every claim.
11 min read
15 October 2026Engineering
Verifying one of our webhooks: signatures, retries and every error, with our own API
Recompute our webhook signature in bash, Python and Node, generate test secrets and keys, read every documented error code, and decode a ULID, against our exact API.
9 min read
15 October 2026Guides
What Google and Yahoo require from bulk senders, and how to prove you meet it
Google and Yahoo both require SPF, DKIM, DMARC, forward/reverse DNS and under 0.3% spam complaints. The '5,000 a day' rule is Google's, not Yahoo's.
7 min read
11 October 2026Engineering
Can AI agents order through a reseller API?
Can AI agents order through a reseller API? Yes, if the API publishes an OpenAPI document, idempotency keys, a sandbox key and signed webhooks for events.
9 min read
11 October 2026Engineering
How to change subscription seat counts without double-charging a customer
How to change subscription seat counts without double-charging a customer: retry the exact seat total and read the 409 error naming the unresolved change.
6 min read
11 October 2026Guides
How to invoice your reseller customers
What a reseller invoice must show, invoicing each sale versus running one bill a month, keeping wholesale cost off the page, and chasing what is overdue.
9 min read
11 October 2026Guides
How to price reseller services: markup, price lists and customer-specific rates
How to price reseller services: set a markup on wholesale cost, choose a price list or an agreed price, and change prices without surprising a customer.
10 min read
11 October 2026Engineering
How to register domains in bulk through an API
Register domains in bulk through an API by checking an exact list first, then sending one idempotent request per domain. The safe workflow, and its limits.
8 min read
11 October 2026Engineering
How to test a reseller API integration in a sandbox
A sandbox proves your code handles a completed order, a failed one, a retried request and a signed webhook. The test plan, and where live still differs.
8 min read
11 October 2026Engineering
Multi-provider failover routing for a reseller API
Multi-provider failover routing for a reseller API tries the cheapest upstream first and falls through on a clear decline, never on an unclear one.
10 min read
11 October 2026Engineering
What happens when you can't pay for a renewal as a reseller
Numbers, mailbox licences and domains each fail a renewal differently: one event and no grace period, a week of retries, or no automatic renewal at all.
7 min read
7 October 2026Guides
Cold email infrastructure: how many domains and mailboxes you need
Vendor guidance implies 20 to 100 mailboxes on 2 to 17 domains per 1,000 cold emails a day. Gmail and Yahoo require spam complaint rates below 0.3%.
10 min read
7 October 2026Comparisons
Domain reseller APIs compared: what developers should check
Domain reseller APIs differ most in retry safety, webhooks, rate limits and test environments, not in REST versus XML. Here is what each one documents.
10 min read
7 October 2026Comparisons
Google Workspace vs Microsoft 365: which is better to resell?
Microsoft 365 is easier to start reselling and publishes its rules; Google Workspace has simpler terms and API, but a contract with Google comes first.
9 min read
7 October 2026Guides
How to become a Google Workspace reseller in 2026
To resell Google Workspace you need a signed Google reseller contract, or a distributor or wholesale platform that holds one. Steps, prices and terms.
10 min read
7 October 2026Guides
How to start a domain and email reselling business
Open a wholesale domain account, add Google Workspace or Microsoft 365 through a distributor, price for renewals, and earn your margin on service.
10 min read
7 October 2026Engineering
Idempotency keys and signed webhooks: the two things a reseller API must get right
An idempotency key makes a retried purchase safe and a signed webhook makes an event trustworthy. Here is what the specs say and how to check a provider.
10 min read
7 October 2026Comparisons
Phone number APIs for receiving SMS, compared
US list prices on 7 October 2026: Plivo has the cheapest local number at $0.50 a month and Telnyx the cheapest inbound SMS at $0.004 per message part.
9 min read
7 October 2026Engineering
Prepaid wallet billing for a reseller platform: holds, captures and a double-entry ledger
A reseller wallet should reserve funds with a hold, capture only what is delivered, release the rest, and record every step in a double-entry ledger.
10 min read
7 October 2026Comparisons
ResellerClub alternatives in 2026, compared
Six ResellerClub alternatives compared on pricing model, API, sandbox, white-label and payment terms, using each vendor's own pages as read in October 2026.
9 min read
7 October 2026Guides
Reselling Microsoft 365: a plain guide to CSP in 2026
New Microsoft 365 resellers join CSP as indirect resellers through a distributor; direct bill needs 12 months of history and USD 1 million in CSP revenue.
10 min read
7 October 2026Comparisons
Twilio alternatives for reselling phone numbers
Telnyx, Plivo, Sinch, Vonage and Bandwidth all separate numbers per customer. Only Telnyx and Vonage document customer balances; none publish reseller margins.
9 min read
7 October 2026Guides
What is a white-label reseller platform?
A white-label reseller platform lets you buy domains, mailbox licences or phone numbers at wholesale and sell them under your own brand and price.
9 min read

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