Async Mailer
Use :async_sendmail or :async_smtp delivery_methods if you want to send emails in a separate thread from the main thread of execution. This way the execution won’t be blocked if email system is under a heavy load. It is very important when you send emails from a model observer which is executed inside of an database transaction.
NOTE: This description has been extracted from the Plugin README and so the formatting may need updating to make browser friendly
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