Werk #7428: email: don't escape email subject and addresses

Component	Notifications
Title	email: don't escape email subject and addresses
Date	Jun 26, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p20 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Since version 1.5.0p14 the subject and addresses of HTML emails were escaped, i.e. the characters '<', '>' and '&' were replaced by '&lt;', '&gt;' and '&amp;', if present. This resulted in a slightly more unreadable subject if any of these characters were present and if an email address contained an ampersand it would result in an invalid (escaped) email address.

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