What bulk email costs, why mail gets rejected, what the mailbox providers now require, and how to integrate sending into an application. Written from operating a sending platform, with the numbers dated and the trade-offs stated rather than smoothed over.
Choosing between providers, with the trade-offs stated.
Nine bulk email services compared on real monthly cost, deliverability controls, and setup time — including the billing model that decides your bill.
Updated 3 Sep 2026 · 9 min read
What sending actually costs, and where the invoice comes from.
Cost per thousand emails across the major providers, the three billing traps that inflate an invoice, and how to work out your own number in five minutes.
Updated 3 Sep 2026 · 8 min read
SES costs a quarter of any platform per message. Here is the layer you build to get there, priced in engineering weeks, and where break-even falls.
Updated 3 Sep 2026 · 5 min read
Billing for addresses you are forbidden to email creates an incentive to delete consent history. How to check what your own platform counts.
Updated 3 Sep 2026 · 5 min read
Getting mail accepted, and diagnosing it when it is not.
The 5,000-a-day threshold, the 0.3% complaint ceiling, and the authentication every mailbox provider now requires — with the failure codes you will see.
Updated 3 Sep 2026 · 7 min read
A diagnostic order for spam-folder problems: authentication first, list quality second, content last. Most of the internet has this sequence backwards.
Updated 3 Sep 2026 · 7 min read
A four-week volume schedule for a new sending domain, what to watch at each step, and how to tell a warm-up problem from a list problem.
Updated 3 Sep 2026 · 6 min read
Eight checks that should block a send rather than warn about it — identity, consent, suppression, quota, reputation — and why one shared path matters.
Updated 3 Sep 2026 · 5 min read
Integrating sending into an application.
The integration decisions that are painful to reverse: retries, idempotency, bounce handling, and keeping receipts away from marketing mail.
Updated 3 Sep 2026 · 7 min read
First domain, first list, first campaign.
The setup that decides whether a campaign arrives: your own domain, a list that opted in, and a small first send. About an hour of work in total.
Updated 3 Sep 2026 · 7 min read
The order that keeps mail arriving during a switch: export suppression first, run both providers in parallel, move transactional last.
Updated 4 Sep 2026 · 7 min read
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