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tidy_email_smtp is just a thin wrapper around letters to provide the same interface as the REST API sibling libraries.
module Config = Letters.Config
The primary data you will need to configure an SMTP connection are hostname, username, and password strings.
val backend : Config.t -> Tidy_email.Email.t -> (unit, string) Lwt_result.t
Send the input email via SMTP.
If the underlying request to the SMTP server is unsuccessful, the response body is provided in the result.