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+# Mail::SMTPPool
+
+This gem is an extension to `Mail` that allows delivery of emails using an SMTP connection pool
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'mail-smtp_pool'
+```
+
+And then execute:
+
+```shell
+bundle
+```
+
+Or install it yourself as:
+
+```shell
+gem install mail-smtp_pool
+```
+
+## Usage with ActionMailer
+
+```ruby
+# config/environments/development.rb
+
+Rails.application.configure do
+  ...
+
+  ActionMailer::Base.add_delivery_method :smtp_pool, Mail::SMTPPool
+
+  config.action_mailer.perform_deliveries = true
+  config.action_mailer.smtp_pool_settings = {
+    pool: Mail::SMTPPool.create_pool(
+      pool_size:            5,
+      pool_timeout:         5,
+      address:              'smtp.gmail.com',
+      port:                 587,
+      domain:               'example.com',
+      user_name:            '<username>',
+      password:             '<password>',
+      authentication:       'plain',
+      enable_starttls_auto: true
+    )
+  }
+end
+```
+
+Configuration options:
+
+* `pool_size` - The maximum number of SMTP connections in the pool. Connections are created lazily as needed.
+* `pool_timeout` - The number of seconds to wait for a connection in the pool to be available. A `Timeout::Error` exception is raised when this is exceeded.
+
+This also accepts all options supported by `Mail::SMTP`. See https://www.rubydoc.info/gems/mail/2.6.1/Mail/SMTP for more information.