Add Capture Development Emails With Mailhog as a Rails til

rails/capture-development-emails-with-mailhog.md

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+# Capture Development Emails With Mailhog
+
+My preferred way to capture and view emails being sent by a Rails app in
+development is to use [MailHog](https://github.com/mailhog/MailHog). It runs a
+local SMTP server at port `1025` and a barebones email client at port `8025`.
+
+The `mailhog` utility can be installed with `brew`:
+
+```bash
+$ brew install mailhog
+```
+
+The development `smtp` settings are configured in
+`config/environments/development.rb`:
+
+```ruby
+  config.action_mailer.delivery_method = :smtp
+  config.action_mailer.smtp_settings = {
+    address: 'localhost',
+    port: 1025,
+  }
+```
+
+Then start running `mailhog` with its default settings:
+
+```bash
+$ mailhog
+```
+
+All outgoing email from the development server will be captured and viewable in
+both `html` and `text` form at `localhost:8025`.