Feature request: Email to non-logged in users (e.g. external participants).

[manwegit]

I'm in a situation that I feel the potential for newdle and would like to have it used at our institution.
The problem is that newdle is needed especially with people outside of our organization and it is too much to ask for people to remember to check after selecting an answer what was the final date.

I haven't yet check the code too deeply, but this change would require backend and ui changes.
configfile: allow-external-email-sending = default to false (current behavior)
maybe a new option in ui settings (like private) - allow-external-email

If this is something that could be added, I'm prepared to do the changes and make a pull request about the feature.

Related to this, export emails in export csv/xlsx