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SMTP Probe

uspeedo.onlineEmail & SMS campaigns

PulseGate's liveness check found it on 14 Sep 2026; it has been in the index since 24 Jul 2026. How this is checked

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.

Inferred · not functionally tested

FreemiumWebAPICloud-managed
SMTP Probe preview
Visit uspeedo.online

Overview

5 features

Purpose: Verifying email address validity and deliverability before adding to marketing or transactional lists.

Inferred · not functionally tested

Audience: email marketers

Inferred · not functionally tested

Functions: data_extraction

Inferred · not functionally tested

Interfaces: API: indicated (inferred, not tested) · MCP: unknown · CLI: unknown · Self-hosting: unknown

Recorded constraints: pricing: freemium · license: Proprietary · platforms: API, WEB · deployment: browser, api_only, cloud_managed

Constraint provenance is unknown; confirm requirements with the publisher.

Record sources: probe.uspeedo.online. These links do not verify the individual claims.

In the Email & SMS campaigns space, SMTP Probe takes a focused approach. Inferred · not functionally tested: It focuses on verifying email address validity and deliverability before adding to marketing or transactional lists. Inferred · not functionally tested: SMTP Probe is a B2B product aimed at email marketers. Basis unknown · not verified: SMTP Probe follows a freemium model. Basis unknown · not verified: SMTP Probe is available on the web and API.

It is developed by uSpeedo. Inferred · not functionally tested: Among its 5 catalogued features are Email Verification, DNS MX Lookup, and SMTP RCPT TO. Inferred · not functionally tested: Catalogued interfaces include a public API.

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

Tasks: Inferred · not functionally tested

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

Topics: Inferred · not functionally tested

Tags
email-verificationsmtp-probedeliverability-checkbulk-email

JSON profile · Text profile · Access guide

Built with & integrations

Connectors
API
Runs on
BrowserAPI-onlyCloud-managed

Trust & compliance

Public signals
HTTPSFree tier

Indexing history

1

What PulseGate has recorded for this listing

  1. Indexed24 Jul · 03:00 UTC
    Show HN: Free Email Verification Tool – no signup required seen via Hacker News firehose (Algolia)
    Source: Hacker News firehose (Algolia) · Open

Frequently asked questions about SMTP Probe

What does SMTP Probe do?
Inferred · not functionally tested: SMTP Probe focuses on verifying email address validity and deliverability before adding to marketing or transactional lists. It is catalogued under Email & SMS campaigns on PulseGate.
Who should use SMTP Probe?
Inferred · not functionally tested: SMTP Probe is a B2B product built for email marketers.
Is SMTP Probe free?
Basis unknown · not verified: Yes — there is a free tier, with paid plans for advanced use.
What platforms does SMTP Probe run on?
Basis unknown · not verified: SMTP Probe runs on the web and API.
Is SMTP Probe still active?
PulseGate's liveness check found it on 14 Sep 2026.
What are alternatives to SMTP Probe?
Similar projects tracked by PulseGate include MailProbe, SMTPing, and SMTP Test Tool.MailProbeSMTPingSMTP Test Tool
Who develops SMTP Probe?
SMTP Probe is developed by uSpeedo.
Does SMTP Probe have an API or integrations?
Inferred · not functionally tested: Yes — SMTP Probe exposes a public API.

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