FREE SMTP List — 10K Working SMTP Servers for Email Campaigns (July 2026 Refresh)

Blacksec · Jul 30, 2026

FREE SMTP LIST — 10K SERVERS Fresh Working SMTPs • Spam Testing • Email Campaigns • July 2026⚠ FOR TESTING AUTHORIZED SYSTEMS ONLY ⚠

SMTP MASTER: Fresh SMTP server list scraped and verified July 2026. These are public/leaked SMTP servers found through extensive scanning. Expect 60-70% to work at time of posting.

BREAKDOWN

Country	Count	Avg Speed	Reliability
United States	3,200	120ms	70%
Russia	1,400	180ms	65%
Germany	980	90ms	75%
Netherlands	720	85ms	78%
France	540	100ms	72%
UK	480	110ms	68%
Brazil	380	220ms	55%
India	300	250ms	45%
Other	2,000	Varies	50-70%

FORMAT

Code:

Format: smtp.host.com:port:username:password
Ports: 25 (standard), 587 (submission), 465 (SSL), 2525 (alt)

Sample:
mail.server1.com:587:admin@domain.com:Pass1234
smtp.relay.net:25:postmaster@domain.com:Welcome1
mail.company.org:465:noreply@company.org:Smtp2026!
smtp.hosting.de:587:user@hosting.de:MeinPasswort1

Each SMTP is tested:
  ✓ Port open and responding
  ✓ SMTP banner present
  ✓ Authentication accepted
  ✓ Relay test (can send to external domain)

USING THESE SMTPs

Code:

Recommended tools:
  - SendBlaster: Windows, easy bulk sending
  - MailWizz: Self-hosted PHP, handles large lists
  - Interspire: Professional email marketing
  - PMTA (PowerMTA): High-performance, billions/day
  - Custom PHP script (included in pack)

Setup tips:
  1. Use 5-10 SMTPs at a time, not all at once
  2. Rotate SMTPs every 100-500 emails
  3. Warm up new SMTPs (send 10/day increasing to 1000/day over 2 weeks)
  4. Track bounces — remove hard bounces immediately
  5. Use different content for each SMTP to avoid fingerprinting
  6. Authenticate with SPF, DKIM, DMARC if sending to major providers
  7. Never exceed 50,000 emails per SMTP per day

HOW TO VERIFY YOUR OWN

Code:

# Quick SMTP checker (bash)
for server in smtp1.com smtp2.com smtp3.com; do
  timeout 5 bash -c "echo > /dev/tcp/$server/25" 2>/dev/null && echo "$server: OPEN" || echo "$server: CLOSED"
done

# Python SMTP tester
import smtplib
def test_smtp(host, port, user, password):
    try:
        server = smtplib.SMTP(host, port, timeout=10)
        server.ehlo()
        if port == 587: server.starttls()
        server.login(user, password)
        print(f"[OK] {host}:{port}")
        server.quit()
        return True
    except Exception as e:
        print(f"[FAIL] {host}:{port} - {e}")
        return False

DOWNLOAD

Code:

MEGA: https://mega.nz/file/BlackSec_FreeSMTP_July2026
Size: 120 KB | Password: SmtpBlackSec2026
Format: TXT, CSV, JSON
Plus: MailWizz import config and PHP send script included

SMTPs die fast. Download now, verify, use immediately.

FREE SMTP List — 10K Working SMTP Servers for Email Campaigns (July 2026 Refresh)

Blacksec

Administrator