Swoosh.Mailer.parse_config

You're seeing just the function parse_config, go back to Swoosh.Mailer module for more information.
Link to this function

parse_config(otp_app, mailer, mailer_config, dynamic_config)

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Parse configs in the following order, later ones taking priority:

  1. mix configs
  2. compiled configs in Mailer module
  3. dynamic configs passed into the function
  4. system envs