Who should use SMTP Probe?

SMTP Probe is a B2B product built for email marketers.

Yes — there is a free tier, with paid plans for advanced use.

What platforms does SMTP Probe run on?

SMTP Probe runs on the web and API.

Is SMTP Probe still active?

Unverified. SMTP Probe has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

Who develops SMTP Probe?

SMTP Probe is developed by uSpeedo.

When did SMTP Probe launch?

SMTP Probe first shipped in 2024.

Does SMTP Probe have an API or integrations?

Yes — SMTP Probe exposes a public API.

Back to the index

SMTP Probe

Name: SMTP Probe
Author: uSpeedo

uspeedo.onlineBusiness & Operations

SMTP Probe provides instant, no-signup email address verification by performing DNS MX lookups, SMTP connection tests, catch-all detection, and blacklist checks. It helps users maintain clean email lists, reduce bounce rates, protect sender reputation, and improve campaign ROI. The tool is available as a free web interface and offers a bulk verification API for higher-volume use cases.

FreemiumWebAPICloud-managed

Visit uspeedo.online

Overview

5 features

In the Business & Operations space, SMTP Probe takes a focused approach. It focuses on verifying email address validity and deliverability before adding to marketing or transactional lists. SMTP Probe is a B2B product aimed at email marketers. SMTP Probe follows a freemium model. SMTP Probe is available on the web and API.

It is developed by uSpeedo, and it first shipped in 2024. Among its 5 catalogued features are Email Verification, DNS MX Lookup, and SMTP RCPT TO. It exposes integrations via a public API.

Summary written by a language model from the project’s public pages.

Email Verification
DNS MX Lookup
SMTP RCPT TO
Catch-all Detection
Blacklist Check

Built with & integrations

Connectors

API

Runs on

BrowserAPI-onlyCloud-managed

Trust & compliance

Verified signals

HTTPSFree tier

Indexing history

What PulseGate has recorded for this listing

Indexed24 Jul · 03:00 UTC
Show HN: Free Email Verification Tool – no signup required verified against its public source
Source: PulseGate · Open

Frequently asked questions about SMTP Probe

What does SMTP Probe do?: SMTP Probe focuses on verifying email address validity and deliverability before adding to marketing or transactional lists. It is catalogued under Business & Operations on PulseGate.
Who should use SMTP Probe?: SMTP Probe is a B2B product built for email marketers.
Is SMTP Probe free?: Yes — there is a free tier, with paid plans for advanced use.
What platforms does SMTP Probe run on?: SMTP Probe runs on the web and API.
Is SMTP Probe still active?: Unverified. SMTP Probe has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
Who develops SMTP Probe?: SMTP Probe is developed by uSpeedo.
When did SMTP Probe launch?: SMTP Probe first shipped in 2024.
Does SMTP Probe have an API or integrations?: Yes — SMTP Probe exposes a public API.

At a glance

Pricing: Freemium · pricing page detected · free tier
Platforms: Api · Web
Languages: English
Built for: email marketers
Model: B2B
Solves: Verifying email address validity and deliverability before adding to marketing or transactional lists.

Developer

uSpeedo

Live coverage

Identity confidence: High · 92
Indexed: 24 Jul 2026
Lifecycle: Alive
Last seen: 24 Jul 2026

Identity audit (13)

Slug: show-hn-free-email-verification-tool-no-signup-required-uspeedo-online
Lifecycle state recorded: 24 Jul 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 24 Jul 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 24 Jul 2026
Canonical URL: https://probe.uspeedo.online/

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