add script for testing app SMTP connections

script/test_app_smtp.rb

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+trap("INT") { puts ; exit }
+
+
+if ARGV[0].nil? || !(ARGV[0] =~ /@/)
+  puts "usage: postal test-app-smtp [email address]"
+  exit 1
+end
+
+require_relative '../config/environment'
+
+begin
+  Timeout.timeout(10) do
+    AppMailer.test_message(ARGV[0]).deliver
+  end
+
+  puts "\e[32mMessage has been sent successfully.\e[0m"
+rescue => e
+  puts "\e[31mMessage was not delivered successfully to SMTP server.\e[0m"
+  puts "Error: #{e.class} (#{e.message})"
+  puts
+  puts "  SMTP Host: #{Postal.config.smtp.host}"
+  puts "  SMTP Port: #{Postal.config.smtp.port}"
+  puts "  SMTP Username: #{Postal.config.smtp.username}"
+  puts "  SMTP Password: #{Postal.config.smtp.password}"
+  puts
+rescue Timeout::Error
+  puts "Sending timed out"
+end