allow the SMTP port to be configurable for outgoing email from the app itself

config/initializers/smtp.rb

@@ -1,5 +1,5 @@
 require 'postal/config'
 if Postal.config&.smtp
   ActionMailer::Base.delivery_method = :smtp
-  ActionMailer::Base.smtp_settings = {:address => Postal.config.smtp.host, :user_name => Postal.config.smtp.username, :password => Postal.config.smtp.password}
+  ActionMailer::Base.smtp_settings = {:address => Postal.config.smtp.host, :user_name => Postal.config.smtp.username, :password => Postal.config.smtp.password, :port => Postal.config.smtp.port || 25}
 end