mongrel_rails and postfix


The environment would be my first guess if Webrick works and Mongrel doesn't.

Any chance that Mongrel is running with the Rails environment set to 'development?' By default, I think config/development.rb has this line:
config.action_mailer.raise_delivery_errors = false

So you wouldn't see delivery errors as exceptions.

And in test, ActionMailer doesn't use the MTA at all:
config.action_mailer.delivery_method = :test


I have an application that uses mongrel_clusters and postfix and it
works just fine "out of the box". I basically followed the Action
Mailer chapter in the Agile book.