Werk #10753: Allow more printable ASCII characters in email addresses

Component	Checks & agents
Title	Allow more printable ASCII characters in email addresses
Date	Mar 17, 2020
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) 1.6.0p11 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p26 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Printable ASCII characters like '#', '$', and "~" as defined by RFC5322 are now allowed in email addresses.

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