The new stunnel proxy functionality got me thinking (which is normally a bad thing):
With HAProxy is it possible to insert an x-forwarded (or similar) in SMTP? F5 suggest: You could insert the IP in the optional comments field, assuming exchange can access it there. Comments: [IP::client_addr] Or from the postfix documentation: XFORWARD Example In the following example, information sent by the client is shown in bold font. 220 server.example.com ESMTP Postfix EHLO client.example.com 250-server.example.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-XFORWARD NAME ADDR PROTO HELO 250 8BITMIME XFORWARD NAME=spike.porcupine.org ADDR=168.100.189.2 PROTO=ESMTP 250 Ok XFORWARD HELO=spike.porcupine.org 250 Ok MAIL FROM:<[email protected]> 250 Ok RCPT TO:<[email protected]> 250 Ok DATA 354 End data with <CR><LF>.<CR><LF> . . .message content. . . . 250 Ok: queued as 3CF6B2AAE8 QUIT 221 Bye -- Regards, Malcolm Turnbull. Loadbalancer.org Ltd. Phone: +44 (0)870 443 8779 http://www.loadbalancer.org/
