Update email ports from 25 to 587

With Mandrill, I've run into the same issue as the OP in http://stackoverflow.com/questions/11356541/cant-get-mandrill-to-send-emails-from-rails-app so I suggest changing the default SMTP port from **25** to __587__. 

I've also found this regarding [Sendgrid's SMTP ports](http://sendgrid.com/docs/User_Guide/smtp_ports.html)