increased default limit of content column; closes #4

README.md

@@ -21,21 +21,26 @@ Rails 3.1+
 ## Installation
 
 Add to your project's Gemfile:
+
 ```
 gem 'mailhopper'
 ```
 
 Install with bundler:
+
 ```
 bundle install
 ```
 
 Generate default initializer and migration files:
+
 ```
 rails generate mailhopper
 ```
 
-Migrate your database:
+*Before migrating your database, please take a moment to review the `CreateEmails` migration that has been generated.* In particular, please review the limit to the `content` field, which has been set to a safe but very large size (100MB characters). You may wish to change this based upon your needs and particular database.
+
+When you're ready, migrate your database:
 
 ```
 rake db:migrate

lib/generators/mailhopper/templates/migrations/create_emails.rb

@@ -16,7 +16,12 @@ def self.up
                :cc_address,
                :bcc_address
 
-      t.text   :content
+      # The content field must be large enough to include the full content of emails, including any attachments. If you
+      # do not plan to send any attachments or long emails, you could leave off this limit. In MySQL, this will result
+      # in a TEXT column with a limit of 64KB characters. Otherwise, 100MB characters seems a safe limit for almost any
+      # email. In MySQL, this will result in the creation of a LONGTEXT column with an actual limit of 4GB characters.
+
+      t.text   :content, :limit => 100.megabytes
 
       t.datetime :sent_at
       t.timestamps