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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.
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