[MlMt] context menu item: copy eMail with `mailto:` link

[Michael Nietzold]

when:

- i have a Mail with an eMail
- the link is there with `mailto:name at domain.com`

what i see:
- i see a context menu: add the `name at domain.com`
- i see a context menu: copy link
- i can use copy link but then is `mailto:name at domain.com` in clipboard


what i expect:
- an context menu: copy email
- after copy in clipboard `name at domain.com`
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