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https://issues.apache.org/jira/browse/JAMES-3788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17575069#comment-17575069
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Benoit Tellier commented on JAMES-3788:
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> I started implementing proxy support on netty level by adding netty's
> HAProxyMessageDecoder. Since HAProxyMessageDecoder requires netty 4.x it will
> be only available for James 3.8.x.
+1
> One issue I'm currently facing is HAProxyMessageDecoder throws an exception
> if no PROXY command was issued. This would mean if you enable proxy support,
> then it's currently not possible to talk directly to James. I will solve that.
IMO the right thing to do is to add an option in protocol configuration to
activate proxy protocol or not, ie in imapserver.xml smtpserver.xml, etc...
> Support for HAProxy Proxy Protocol
> ----------------------------------
>
> Key: JAMES-3788
> URL: https://issues.apache.org/jira/browse/JAMES-3788
> Project: James Server
> Issue Type: New Feature
> Components: protocols
> Reporter: ouvtam
> Priority: Minor
>
> As proposed in the gitter channel I would like to add support for HAProxy's
> PROXY protocol
> ([https://www.haproxy.org/download/2.7/doc/proxy-protocol.txt|https://www.haproxy.org/download/2.7/doc/proxy-protocol.txt).]).
> This allows to run James behind HAProxy (i.e. load balancing multiple James
> instances). In order to properly support the proxy protocol James needs to
> parse the provided PROXY arguments from HAProxy (remote ip address, remote
> port etc.) and store it in the SMTPSession for further processing (e.g.
> DNSRBL check, Authorized Networks etc.). Otherwise James uses HAProxy's
> address (e.g. localhost) as remote address.
> For instance, HAProxy sends following line after connecting:
> {code:java}
> "PROXY TCP4 255.255.255.255 255.255.255.255 65535 65535\r\n" {code}
> Netty already provides a codec for HAProxy's protocol
> (io.netty.handler.codec.haproxy), so this can be implemented in the transport
> layer of James.
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