I am using the vacation utility on linux, Slackware64 14.1. When running, the $HOME/.vacation file has:
\\myuserId, "|/usr/bin/vacation myuserId"
This all works fine except that spam messages get responded to by vacation. How can I not have vacation sent out-of-office notices to spam? Note that spam will always have "[SPAM]" in the subject line, e.g.:
Subject: 4.4 [SPAM] Buy now and save