hide pw data in logs
support getting auth data from environment to support drone.io

Signed-off-by: alexlehm <alexlehm@gmail.com>
change test config to mailgun

Signed-off-by: alexlehm <alexlehm@gmail.com>
get smtp credentials from environment when running in CI
added sendgrid config
copied asciidoc from apex example

Signed-off-by: alexlehm <alexlehm@gmail.com>