wrap mailaddresses in plain text mails into mailto-links

[Djfe]

Checklist

• I have used the search function to see if someone else has already submitted the same feature request.
• I will describe the problem with as much detail as possible.
• This issue only contains a request for one single feature, not multiple (related) features.

App version

6.202

Problem you are trying to solve

Plain text emails are converted to html by K9.
URLs in those mails are already being wrapped into links.
Mailaddresses should be wrapped into links as well.

Suggested solution

examples:
Am 08.02.18, 11:25 schrieb "someone" <abc@xyz.de>:
I will email abc@xyz.de later.

It would be nice if both of these whould be wrapped as <a href="mailto:abc@xyz.de">abc@xyz.de</a>

Screenshots / Drawings / Technical details

No response