method split out to smtp and sendmail
rewrite if block guard to return guard
indent adjustment
Revert "rewrite if block guard to return guard"

This reverts commit fb3fae5a1b0e9b4dee6cd896fc641c2d2a53e67b.

Conflicts:
	app/mailers/application_mailer.rb
remove blank line
Merge branch 'application_mailer' of github.com:gouf/shirasagi into gouf-application_mailer
Merge branch 'gouf-application_mailer'
add app: sys_mail_test