Issue with SMTP Protocol: Cannot Handshake Client Error

[Y-GM]

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Describe the bug
When attempting to use the SMTP protocol through Mubeng, the connection fails with an error. The log shows a Cannot handshake client ... EOF message, indicating that Mubeng is unable to complete the handshake with the SMTP server.

To Reproduce
Steps to reproduce the behavior:

> mubeng -a :8080 -f proxies.txt -w

In the proxies.txt file, the proxy is configured with SMTP details as follows:

http://k2pqyc1der1biug-country-fr-session-*****-lifetime-2:rs3es3mvo*****@rp.proxyscrape.com:6060

Expected behavior
Mubeng should successfully establish a handshake with the SMTP server, allowing SMTP traffic to flow through the proxy.

Screenshots

Environment :

• OS: Windows
• Mubeng Version: v0.18.0

Additional context
Full error log:

2024/10/28 15:09:17 [001] WARN: Cannot handshake client 212.27.48.4:587 EOF

Is there any specific configuration needed for SMTP protocol support in Mubeng, or is SMTP protocol unsupported?

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