The Mail gem changed format of the delivery method arguments for
sendmail from a string to an array of strings in this commit
7e1196bd29
As the settings are now a sendmail delivery method produces the
following error:
```
.../mail-2.8.0/lib/mail/network/delivery_methods/sendmail.rb:53:in `initialize': :arguments expected to be an Array of individual string args (ArgumentError)
```
This also updates the mail dependency since the new default won't work
with the older versions.
Since `bin/test` would define `Rails.root` before loading AM but `bundle
exec rake` would define it after loading AM, this lead to the following
test failure when using `bin/test`:
```
--- expected
+++ actual
@@ -1 +1 @@
-{:location=>"/var/folders/_r/9kh50y4j0vn7zgg2p65z1lcm0000gn/T/mails"}
+{:location=>"/Users/senny/Projects/rails/actionmailer/tmp/mails"}
```
This patch ensures that `Rails.root` is defined when loading AM to
achieve consistent test results.
This reverts commit 70d6e16fbad75b89dd1798ed697e7732b8606fa3, reversing
changes made to ea4db3bc078fb3093ecdddffdf4f2f4ff3e1e8f9.
Seems to be a code merge done by mistake.
Reverting because it feels backward to specify a delivery to not
be performed while the e-mail is being composed. It is simpler (and
makes more sense) to delegate the responsibility to the calling code.
