An action block that compose an message in the default e-mail app, user has to send.
The fiber will proceed immediately without pause.
The To, CC and BCC e-mail addresses can contain a single address,
a comma separated list or an array of addresses.
- To — e-mail address that should be delivered to.
- CC — e-mail address that should be carbon copied.
- BCC — e-mail address that should be blind carbon copied.
- Subject — message subject.
- Message — message body.
- Attachments — path to a file, or an array thereof, to include as an attachments.