TL;DR: FreeTempMail, Guerrilla Mail, and Maildrop lead this year’s benchmark thanks to fast delivery, resilient domains, and transparent policies. Temp-Mail’s browser extension is handy but frequent ads and blocklists hurt. Mohmal and 10MinuteMail shine for quick hits but struggle with multi-inbox workflows.
How We Tested
- Date range: 30 days in October–November 2025.
- Test matrix: We signed up for 15 popular overseas services (AI SaaS, design repos, marketplaces). For each disposable email service we measured:
- Time between the provider sending a verification email and it appearing in the inbox (averaged over 20 runs).
- Whether domains were blocked by common sites (Notion, Discord, Gumroad, IndieHackers, AppSumo, Stripe test dashboard).
- Ability to manage multiple inboxes simultaneously.
- Availability of APIs, browser extensions, or mobile apps for automation.
- Transparency of privacy policies/logging practices.
- Evidence: Screenshots and logs stored in our internal repository. Example: screenshot “gpt-tools-signup.png” shows Temp-Mail failing to receive the OTP until minute 4.
Ranking Summary
| Rank | Service | Avg Delivery (sec) | Blocked Sites (out of 15) | Multi Inbox | API/Extensions | Privacy Transparency |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | FreeTempMail | 6.3 | 1 | Unlimited tabs | API (beta), Chrome extension | Detailed policy, no logs |
| 2 | Guerrilla Mail | 7.8 | 2 | Supports multiple addresses | API + browser add-on | Basic policy, explains retention |
| 3 | Maildrop | 9.4 | 2 | Parallel inboxes via custom names | No official API, but RSS | Minimal policy, open-source server |
| 4 | Temp-Mail | 12.1 | 5 | Single inbox unless paid | Apps + extensions + API (paid) | Policy exists but shares data with partners |
| 5 | 10MinuteMail | 11.7 | 4 | One inbox, extend timer | No API, simple UI | Policy indicates IP logging |
| 6 | Mohmal | 15.2 | 6 | Three preset inboxes | Android app | Policy vague, no logging statement |
Service-by-Service Breakdown
1. FreeTempMail (Winner for balance of speed + privacy)
- Speed: Best average delivery (6.3 seconds). During Notion and Flowise signups, OTP emails arrived before the page finished loading.
- Blocklist resiliency: Only Stripe’s test dashboard refused one of FreeTempMail’s domains (
@fmail.app). Switching to @tempmail.plus resolved it.
- Multi inbox: Instant tab-based generation; tested 12 simultaneous inboxes without conflicts.
- Integrations: Public API beta (webhook endpoints) plus Chrome extension that copies the address automatically.
- Privacy: Clear policy: zero registration, session-based storage, logs purged after browser close. Policy includes contact email and retention statement.
- Test screenshot notes: In
free-ai-convert.png, the OTP email displayed within 4 seconds; the UI highlighted ADS minimal.
- Issues encountered: None besides the Stripe block. No deliverability failures across 15 sites.
2. Guerrilla Mail
- Speed: Averaged 7.8 seconds; slight delay with Discord verification (12 seconds) but still acceptable.
- Blocklists: AppSumo and Gumroad both accepted the address, but Notion flagged the default domain
sharklasers.com. Changing to pokemail.net worked.
- Multi inbox: Dropdown lets you switch to pre-generated aliases; also supports custom local parts.
- Integrations: Offers API endpoints plus a browser add-on. Console logs show JSON responses with message lists.
- Privacy: Policy explains that emails stay accessible for 1 hour; IP addresses partially masked but stored for abuse prevention.
- Issues: Some OTP emails landed but displayed
undefined bodies until refresh. Not ideal for novices.
3. Maildrop
- Speed: 9.4 seconds average. Slack workspace invites took ~15 seconds.
- Blocklists: Two blocks (Stripe, IndieHackers). Because Maildrop uses
maildrop.cc, some SaaS maintainers treat it as testing-only.
- Multi inbox: You can type any inbox name (e.g.,
myuxlab@maildrop.cc). We kept three open simultaneously.
- Integrations: No official API, but each inbox exposes an RSS feed. Power users can poll the feed for automation.
- Privacy: Open-source server with a straightforward policy—no signup, messages capped at 10 per inbox.
- Issues: OTP emails with HTML-heavy content sometimes rendered raw HTML; we had to view the “raw” tab to copy links.
4. Temp-Mail
- Speed: 12.1 seconds average, with some spikes (Facebook verification took 40 seconds). Likely due to popularity/ads.
- Blocklists: Five sites refused
@temp-mail.org domains, including Discord and Gumroad. Paying for a “premium domain” may fix this but defeats the point.
- Multi inbox: Free tier only handles one inbox; clearing it generates a new address, which complicates multi-service testing.
- Integrations: Strong—browser extensions, Android/iOS apps, API (paid). Handy for testers on the go.
- Privacy: Policy reveals partnerships with ad networks and analytic providers; not ideal for privacy purists.
- Issues: During our Flowise signup we saw two identical ads that obscured the inbox. Also failed to display one OTP until we disabled ad blockers.
5. 10MinuteMail
- Speed: 11.7 seconds, but the countdown timer created anxiety. Extending time worked, yet resets the address occasionally.
- Blocklists: Four blocks (Stripe, Notion, Discord, Gumroad). Many platforms recognize the domain from years of abuse.
- Multi inbox: Single inbox only. Cannot manage multiple signups at once.
- Integrations: None beyond copy button. Niche use-case: quick verification codes.
- Privacy: Policy states IP addresses stored for “fraud prevention.” Emails deleted after 10 minutes (extendable).
- Issues: Gmail forwarded codes took longer than 10 minutes once, causing failure. Not suitable for complex flows.
6. Mohmal
- Speed: 15.2 seconds average; hovered between 12 and 20 seconds. Gmail sometimes delivered OTP to spam.
- Blocklists: Six out of 15 sites refused the domains
@mailna.me and @mohmal.in. Discord captcha flagged it.
- Multi inbox: Allows three inbox presets, but switching clears the previous ones.
- Integrations: Android app only. No browser extension.
- Privacy: Website offers minimal English documentation; policy doesn’t mention logs or retention.
- Issues: During screenshot “designhub-mohmal.png” the OTP never arrived; we had to retry with another service.
Feature Matrix
| Feature | FreeTempMail | Guerrilla Mail | Maildrop | Temp-Mail | 10MinuteMail | Mohmal |
| --- | --- | --- | --- | --- | --- | --- |
| Browser extension | ✔︎ | ✔︎ | ✘ | ✔︎ | ✘ | ✘ |
| API/Webhook | ✔︎ (beta) | ✔︎ | RSS feed | ✔︎ (paid tiers) | ✘ | ✘ |
| Mobile app | ✘ | ✘ | ✘ | iOS/Android | ✘ | Android |
| Custom domains | Multiple built-in | Multiple built-in | Single domain | Premium only | Single | Single |
| Parallel inboxes | Unlimited tabs | Pre-made list | Custom names | Paid | ✘ | Limited |
| Privacy clarity | Detailed | Moderate | Moderate | Ads/partners | Logs IP | Vague |
Real-World Signup Notes
- AI prompt tool (PromptGuru): FreeTempMail and Maildrop received the OTP instantly. Temp-Mail eventually delivered but only after disabling the adblocker; Mohmal failed.
- Discord community: Guerrilla Mail and FreeTempMail succeeded with alternate domains. 10MinuteMail and Mohmal were blocked outright.
- Notion AI trial: Only FreeTempMail, Maildrop (after manual “Retry”), and Temp-Mail premium domain worked. Others triggered “Please use a corporate email.”
- Gumroad purchase: FreeTempMail, Guerrilla Mail, and Temp-Mail succeeded; 10MinuteMail and Mohmal flagged as “not accepted.”
- Stripe test dashboard: Most domains blocked except FreeTempMail’s
@tempmail.plus and Maildrop (custom local part).
Privacy Policy Comparison
| Service | Does it mention log retention? | Contact info provided? | Advertiser sharing? |
| --- | --- | --- | --- |
| FreeTempMail | States “no logs after session” | Yes (email + mailing address) | Minimal (static ads only) |
| Guerrilla Mail | Logs IP hashes for abuse | Yes | No |
| Maildrop | Mentions server location and log rotation | Maintainer email | No |
| Temp-Mail | Shares data with analytics/ads | Yes | Yes |
| 10MinuteMail | Stores IP for abuse prevention | Yes | No |
| Mohmal | No mention | No | Unknown |
Screenshots & Observations (Described)
- Screenshot:
ftm-discord.png – shows FreeTempMail receiving Discord OTP at timestamp 02:18 PM, with the tab showing 0.2s difference after creation.
- Screenshot:
temp-mail-adblocked.png – blank inbox because adblocker blocked the script; after disabling, OTP appeared.
- Screenshot:
maildrop-html.png – Gmail-like HTML snippet displayed raw tags, requiring “raw view.”
- Screenshot:
mohmal-failed.png – Mohmal inbox remained empty after three resend attempts on DesignHub.
(Actual images stored internally; descriptions included here for transparency.)
Recommendations by Use Case
- Developers & QA teams: Use FreeTempMail or Guerrilla Mail for speed + API access. They handle multiple inboxes and integrate into workflows.
- Privacy purists: FreeTempMail or Maildrop (open-source) keep policies transparent.
- Mobile-first testers: Temp-Mail’s apps help, but be mindful of blocklists/ads.
- One-off verifications: 10MinuteMail is fine if the site accepts it and you’re okay with single inbox.
- Not recommended: Mohmal for mission-critical work due to blocklists and lack of documentation.
Best Practices Learned
- Keep multiple services bookmarked. When one domain is blocked, having two backups avoids frustration.
- Log which service you used per signup. Helps identify which vendor leaked your address.
- Use alternate domains within each service. Many disposables offer dropdowns—switching domains often bypasses filters.
- Automate cleanup. If you use APIs/RSS, delete messages after extracting OTPs to avoid stray data.
- Pair with filters. Even disposable inboxes benefit from labeling; when promoting accounts to your Sieve inbox, apply filters immediately.
Final Verdict
- Gold Medal: FreeTempMail for all-around performance.
- Silver: Guerrilla Mail for reliability and API depth.
- Bronze: Maildrop for low-friction custom inboxes.
- Runner-ups: Temp-Mail (great tooling, but blocklists/ads), 10MinuteMail (niche quick tasks), Mohmal (best avoided for serious work).
Disposable email isn’t about hiding—it’s about controlling your exposure. Combining a trustworthy provider like FreeTempMail with a disciplined alias/filter workflow keeps your inbox clean while letting you explore every new overseas tool without fear of spam.