* Update configuration.rake
use env variable SMTP_TEST_RECIPIENT so customers using mail providers like Microsoft can specify RFC 2606 compliant destination test recipients
* add SMTP_TEST_RECIPIENT to sample.env
add SMTP_TEST_RECIPIENT to sample.env with default value to ensure retro compatibility
* default to notifications@example.com
default to notifications@example.com should SMTP_TEST_RECIPIENT not be defined
Co-authored-by: Ahmad Farhat <ahmad.af.farhat@gmail.com>