[2.2.0] Checkmk Werk 16375 created: Rule "Check Email": Allow all makros

Title: Rule "Check Email": Allow all makros Class: fix Compatible: compat Component: checks Date: 1705327143 Edition: cre Level: 1 Version: 2.2.0p19 The ruleset "Check Email" recently featured stricter validation. As a result, no makros (like <code>$HOSTNAME$</code>) could be used anymore. This was partially compensated for in <a href="https://checkmk.com/werk/15203">#15203</a>gt;#15203</a>, but this was still too restrictive. Users can now configure validated host adresses or unvalidated strings containing macros.