[PATCH]: IPv6 SMTP proxy with XCLIENT

Mon Aug 22 12:45:19 UTC 2011

Hello!

There is a issue with XCLIENT support when nginx listener is IPv6 enabled. 
Nginx sends the following command to upstream SMTP server:

XCLIENT ADDR=2001:15c0:65ff:xxxx::yyyy NAME=[UNAVAILABLE]

According to postfix docs (http://www.postfix.org/XCLIENT_README.html) IPv6 
client addresses should be prefixed with "IPV6:" string, so nginx should send 
the following xclient command to upstream:

XCLIENT ADDR=IPV6:2001:15c0:65ff:xxxx::yyyy NAME=[UNAVAILABLE]

Attached patch fixes this issue. It would be great if it would be included in 
upstream after careful review.

Best regards, Brane
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