Extended retention for stress-free debugging
Mailisk caps retention at 15 days across all plans. At Facteur, your messages stay available longer to inspect past CI failures or audit long-running journeys.
Migration
Email and SMS testing with longer configurable retention, unlimited inboxes from the Team plan, and per-inbox quotas to control your budget.
Moving from Mailisk to Facteur happens simply in your tests: automatic waiting and native OTP extraction streamline your assertions. Both services can run side by side during the switch.
What you gain: longer retention to debug your suites without losing history, per-inbox quotas with alerts, and data sovereignty hosted in France.
Mailisk caps retention at 15 days across all plans. At Facteur, your messages stay available longer to inspect past CI failures or audit long-running journeys.
A runaway test can quickly consume your organization capacity. Facteur lets you set a per-inbox ceiling and get a Slack/email alert before any bottleneck.
Facteur handles SMS reception and extracts one-time codes automatically, saving you from juggling multiple services for your auth workflows.
OVHcloud infrastructure in France, billed in euros, with a DPA downloadable online without sales negotiations.
With Mailisk you query namespaces and poll for messages. With Facteur, a single call blocks until arrival and delivers the body, links, and OTP code pre-extracted.
mailisk.searchInbox() + polling → messages.waitFor()
const client = new MailiskClient({ apiKey: API_KEY });
// Search and poll for the message.
const res = await client.searchInbox(NAMESPACE, { to_addr: address });
await new Promise((r) => setTimeout(r, 3_000));
const email = res.data[0];
const code = email.text.match(/\b\d{6}\b/)?.[0];import { Facteur } from '@facteur-eu/sdk';
const facteur = new Facteur({ apiKey: process.env.FACTEUR_API_KEY });
// Blocks until arrival. No sleep, no retry.
const message = await facteur.messages.waitFor({
inbox: INBOX_ID,
sentTo: address,
wait: 30_000,
});
const code = message.otp;The Mailisk code above reflects their API search structure. Facteur code runs as written.
Nothing is transferred: test messages regenerate on your suite’s next run. Both services can run side by side until everything is green.
Every inbox gets its own subdomain, and any address ending in it is accepted from the first message. There is nothing else to provision.
In your test scenarios, update the recipient address to target your Facteur inbox domain.
Remove polling loops and sleeps: messages.waitFor() blocks until arrival and hands back the OTP code directly in message.otp.
Keep both accounts until your CI suite is green: there is no data to export and no DNS to switch.
| Facteur | Mailisk | |
|---|---|---|
| Maximum retention | Several times theirs, set inbox by inbox | Capped at 15 days on all plans |
| Message volume | Bought separately, as packs valid for a year | Fixed by the subscription tier |
| Granularity | You pay for the volume you consume | You pay for the tier above |
| Going over | Prepaid packs, or capped pay-as-you-go | Tolerated, then a conversation |
| Per-inbox quotas | Yes, with overage alerts | Not documented |
| Hosting | France, billed in euros | Outside France, billed in dollars |
| DPA | Downloadable online | On request |
Their amounts are read from the data their own pricing page serves, not copied from a screenshot. These are their monthly prices; their annual formula is cheaper, as is ours.
Converted from US dollars at 0.92, read on 11 August 2026.
Yes. At equal volume, our pricing is level with them or slightly lower. But beyond list price, Facteur includes several times longer retention, unlimited inboxes from the Team plan, per-inbox quotas to prevent billing surprises, and native SMS OTP support.
Keeping messages longer lets you debug build failures occurring over the weekend or re-examine complex test histories without paying extra. Mailisk caps retention at 15 days on all plans.
Facteur lets you set strict ceilings and alert thresholds per inbox, and add volume via 1-year rollover capacity packs. You retain total cost control without worrying about a runaway loop draining your organization capacity.
A few minutes per test file: simply replace search and polling loops with the blocking messages.waitFor() call. There is no data to export; test messages regenerate automatically on your next CI run.
Other comparisons: Mailtrap · MailSlurp · Mailpit · Mailosaur
The free plan asks for no card. If you are switching tools, the steps fit on one page and can be tried on a single test.