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 Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p11 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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