HAProxy SMTP proxy-protocol handler for extending the golang mailsac mailproto/smtpd fork library.
https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt
v1 protocol is supported. v2 protocol is not supported (TBD).
This package allows an upstream proxy to modify the end user IP address on an SMTP connection.
import (
proxyhandler "github.com/mailsac/smtpd-proxyhandler"
"github.com/mailsac/smtpd"
)
server := smtpd.NewServer(messageHandler)
// ... set up server, then add upstream proxy IP addresses
allowProxyIPs := []string{"10.0.0.1", "10.0.0.2"}
handler := proxyhandler.ProxyHandlerV1{ TrustIPs: allowProxyIPs }
server.Extend("PROXY", &handler)
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