This patch implements support for incoming connections wrapped in the HAProxy protocol v1. This is useful when running chasquid behind a HAProxy server, as it needs the original source IP to perform SPF checks. This patch is a reimplementation of one originally provided by Denys Vitali in pull request #15, except the logic for the protocol handling is moved to a new package, and the smtpsrv.Conn handling of the source IP is simplified. It is marked as experimental for now, since we want to give it a bit more exposure just in case the option/api needs adjustment. Thanks a lot to Denys Vitali (@denysvitali in github) for sending the original patch for this, and helping test it!
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