When using the Sendgrid add-on, the following needs to be in
config/production.rb:
config.action_mailer.default_url_options = {:host => 'smtp.sendgrid.net'}
or you will get errors that complain about hostname not being set when
you attempt to send emails using SendGrid.
Someone please update http://docs.heroku.com/sendgrid to reflect this.
Thanks,
Wes Gamble
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