[Issue 18023] std.net.isemail is copied from code and the license was changed. This must be fixed.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18023

--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> ---
https://github.com/dlang/phobos/pull/5897

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