When running a Docker deployment, we need a way to set the app's base
URL. Otherwise links in emails, or generated in jobs etc., can not be
correctly constructed.
* Add more configuration options for the SMTP connection
* Add SMTP_TLS option for implicit TLS connections
For SMTPS servers (typically port 465), set SMTP_TLS=true.
Port auto-defaults to 465 when TLS is enabled, 587 otherwise.
STARTTLS is used by default and automatically disabled when TLS is on.
Fixes boolean conversion bug in original PR (string "false" is truthy)
and removes insecure default for certificate verification.
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Co-authored-by: Jeremy Daer <jeremy@37signals.com>
Jorge Manrubia