Zdenek Valach wrote:

Is there way how to make Stunnel for example after each
establishment of TCP connection to send to SMTP/POP3
server port some special command like

REMOTEIP 123.123.123.123<crlf>

Good news:
This feature is already available in stunnel since version 4.45.

To enable it add the following line to your stunnel.conf:
    protocol = proxy

Protocol description:
    http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt

Best regards,
    Michal Trojnara

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