550, b'Message delivery failed

[evilfox007]

Verify SMTP server is running: est server --port 2525
2025-06-15 19:47:09,096 - INFO - Test logged: scenario_test - CEO Fraud - Urgent Wire Transfe

🚀 Server Status: ACTIVE
📡 Listening on: 0.0.0.0:2525
📁 Log file: /root/.est/est_tests.log
📊 Statistics: 0 connections, 0 emails processed

⚡ Server Features:
• Multi-threaded connection handling
• Automatic MX record resolution
• Real-time email relay to destinations
• Comprehensive audit logging
• Professional SMTP protocol compliance

🎯 Quick Test Commands:
telnet 0.0.0.0 2525
est test 1 target@example.com

🛑 Press Ctrl+C to stop server

2025-06-15 19:45:19,839 - INFO - New SMTP connection from 127.0.0.1:34782
2025-06-15 19:45:19,840 - INFO - [127.0.0.1:34782] Spoofed sender: ceo@targetcompany.com
2025-06-15 19:45:19,840 - INFO - [127.0.0.1:34782] Target: anshadmuhammedp9@gmail.com
2025-06-15 19:45:19,841 - INFO - [127.0.0.1:34782] Processing spoofed email from ceo@targetcompany.com to ['anshadmuhammedp9@gmail.com']
2025-06-15 19:45:19,841 - WARNING - DNS library not available, using fallbacks
2025-06-15 19:45:19,972 - INFO - Attempting relay to anshadmuhammedp9@gmail.com via 0 MX servers
2025-06-15 19:45:19,972 - ERROR - ❌ All relay attempts failed for anshadmuhammedp9@gmail.com
2025-06-15 19:45:19,975 - INFO - [127.0.0.1:34782] Connection closed
2025-06-15 19:46:53,004 - INFO - New SMTP connection from 127.0.0.1:40182
2025-06-15 19:46:53,006 - INFO - [127.0.0.1:40182] Spoofed sender: ceo@targetcompany.com
2025-06-15 19:46:53,006 - INFO - [127.0.0.1:40182] Target: refoma5937@hosliy.com
2025-06-15 19:46:53,007 - INFO - [127.0.0.1:40182] Processing spoofed email from ceo@targetcompany.com to ['refoma5937@hosliy.com']
2025-06-15 19:46:53,007 - WARNING - DNS library not available, using fallbacks
2025-06-15 19:46:53,754 - INFO - Attempting relay to refoma5937@hosliy.com via 1 MX servers
2025-06-15 19:47:09,092 - WARNING - ❌ Relay failed via mail.hosliy.com: timed out...
2025-06-15 19:47:09,092 - ERROR - ❌ All relay attempts failed for refoma5937@hosliy.com
2025-06-15 19:47:09,097 - INFO - [127.0.0.1:40182] Connection closed

[LAG-Yadav]

Im having the same issue

[Segrazoo]

It fails waste of time

[Gray-0men]

Most of you realize your ISPs started blocking outbound port 25 right? That's needed for this to work, don't run this on your home setup and it'll work. I got the same issue until I remembered this and switched to cloud kali instance.

[shubham4734singh]

Same issue

[Sergey842248]

I got the same issue until I remembered this and switched to cloud kali instance.

How did you do that? I set up kali in aws but still if I try running it on port 25 the cmd est test 1 e-mail... expects port 2525