spree/spree — pull request #2739 by kennyadsl (2013-03-23 12:28:28+00:00)
Title: Fix specs for mail interceptor

It solves this kind of errors running specs:

```
Spree::OrderMailer#deliver when intercept_mode is not provided should not modify the recipient
Failure/Error: message.deliver
ArgumentError:
A sender (Return-Path, Sender or From) required to send a message
# ./spec/lib/mail_interceptor_spec.rb:72:in `block (4 levels) in '
```

thanks to @mtylty for the original solution.