Feature Request: Documentation Update For Email Configuration

[ltieman]

Problem
The documentation does not include information for connecting to an email server via SMTP without SSL, or to providers like Postmark that use a technology that starts without SSL and then upgrades to SSL after the handshake.

Solution
The Environment Variable EMAIL_HOST_SECURE=0 needs to be set to allow SMTP connections without SSL. Likewise, EMAIL_HOST_SECURE=1 will require SSL This should be added to the HOWTO_EMAIL_CONFIGURATION.md documentation and the other documentation on the environment variable. These environment variables are read in using the email library used by Spoke, and are not touched otherwise in the code.