This is the Linux app named SMTP-Checker-Pro2026 whose latest release can be downloaded as SMTP-Checker-Pro-INSTALLER.html. It can be run online in the free hosting provider OnWorks for workstations.
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SMTP-Checker-Pro2026
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DESCRIPTION
** SMTP-Checker-Pro2026 – Ultimate SMTP Checker & Email Verifier Tool (2026 Edition)
SMTP-Checker-Pro2026 is the fastest, most accurate SMTP checker and bulk email validator in 2026. Instantly check unlimited SMTP servers, verify email lists at 500,000+/hour, and test deliverability with real-time inbox placement results.
**Top Features:**
✅ Ultra-fast multi-threaded SMTP checking (up to 1000 threads)
✅ Full SMTP authentication testing (LOGIN, PLAIN, CRAM-MD5, OAuth2)
✅ Real mailbox validation + catch-all detection
✅ Inbox tester with Gmail, Yahoo, Outlook, Office365 seeds
✅ Detailed response codes (250, 550, 552, greylisting, SPF/DKIM/DMARC checks)
✅ Proxy support (HTTP/SOCKS5 + private rotating proxies)
✅ CSV/Excel/TXT import & clean export (valid, invalid, unknown, catch-all)
✅ API integration + Windows/Linux/Mac compatible
Perfect for email marketers, cold outreach, and deliverability experts. Boost your open rates remove bad SMTPs and risky email
Features
- Ultra-Fast Multi-Threaded SMTP Connection Testing – Up to 1000+ concurrent threads with connection timeouts as low as 3–30 seconds for lightning-fast bulk SMTP server validation. Full SMTP Command Simulation & Response Code Analysis – Executes complete SMTP dialog (EHLO → MAIL FROM → RCPT TO → QUIT) and captures exact server responses (250 OK, 550 User Unknown, 552 Mailbox Full, 421 Greylisted, etc.).
- Full SMTP Command Simulation & Response Code Analysis – Executes complete SMTP dialog (EHLO → MAIL FROM → RCPT TO → QUIT) and captures exact server responses (250 OK, 550 User Unknown, 552 Mailbox Full, 421 Greylisted, etc.).
- Advanced Authentication Method Testing – Automatically detects and tests all supported auth mechanisms: LOGIN, PLAIN, CRAM-MD5, NTLM, DIGEST-MD5, OAuth2/XOAUTH2 for Gmail & Microsoft.
- Precise Catch-All & Greylisting Detection – Sends multiple RCPT TO probes with fake & real-looking addresses to reliably identify catch-all domains and temporary greylisting behavior.
- Robust Proxy & Anonymity Support – Native HTTP/SOCKS5/Elite + rotating residential proxies and Tor routing to bypass IP bans and rate limits during high-volume SMTP checking.
This is an application that can also be fetched from https://sourceforge.net/projects/smtp-checker-pro2026/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.
