A Mailosaur Alternative for Email and Test Automation
Mailosaur is a polished, well-supported email + SMS testing platform aimed at QA teams. It’s genuinely good — but it’s priced for teams, meters on both users and volume, and keeps messages only a few days on lower tiers. If you mainly need to read verification emails in CI, Devmailr is a simpler, cheaper alternative. Here’s the comparison.
Disclaimer: We make Devmailr, so weigh this accordingly — we’ve tried to be fair, and Mailosaur is a strong, well-liked product. Features and prices change; check both sites.
What Mailosaur does well
Mailosaur is feature-rich and pleasant to use: server-based virtual inboxes, email and SMS testing through one API, per-message SPF/DKIM/DMARC and SpamAssassin analysis, verification-code and link extraction, cross-client previews, custom domains, and deep framework integrations. Reviewers consistently praise its support.
Where developers feel the squeeze
The common gripes from reviews:
- Cost as you scale — “expensive, particularly as testing volume grows.”
- Metered on users and volume — charged on two axes.
- Short retention on lower tiers — messages kept roughly 3–14 days depending on plan.
- SMS pricing — the most-cited “too expensive to justify.”
- Stingy defaults — a low default daily email limit on entry tiers, and no free tier.
How Devmailr compares
Devmailr covers the email-testing essentials at a lower, simpler price:
- Disposable inboxes + REST API from €5/mo, with no per-user metering.
- Wait-for-email, code/link extraction, SPF/DKIM/DMARC verdicts, search, and an SSE stream.
- Email-only — no SMS (if you need 2FA-by-text, Mailosaur is the better fit).
- A free tier to start, no card required.
Side by side
| Feature | Mailosaur | Devmailr |
|---|---|---|
| Virtual / disposable inboxes | Yes | Yes |
| Wait-for-email | Yes | Yes |
| Code / link extraction | Yes | Yes |
| SPF/DKIM/DMARC verdicts | Yes | Yes |
| SpamAssassin spam score | Yes | — (pass/fail verdicts) |
| SMS / phone numbers | Yes | — |
| Custom domains | Yes | — (planned) |
| Per-user metering | Yes | No |
| Entry price | ~$9/mo (no free tier) | Free / €5 |
Approximate, as of 2026 — check each site for current details.
Which should you pick?
- QA team needing email + SMS, spam scoring, custom domains, and enterprise support: Mailosaur.
- Developer who mainly reads verification emails in CI and wants it cheap and simple: Devmailr.
See the wider field in the best disposable email APIs for testing, or get going with the create → wait → extract pattern.
Try it in two minutes
Create a disposable prefix@devmailr.app inbox over the API, send mail to it from your app, and read it in your tests. Free plan, no card required.