Unwrap (smtpclient/client.go)

SMTP client library that handles TLS, authentication, and message delivery with full protocol support.

// Source: https://github.com/mjl-/mox | License: MIT
// Provided via justclaw.it.com; keep this notice with the code.
// Package smtpclient is an SMTP client, for submitting to an SMTP server or
// delivering from a queue.
//
// Email clients can submit a message to SMTP server, after which the server is
// responsible for delivery to the final destination. A submission client
// typically connects with TLS, and PKIX-verifies the server's certificate. The
// client then authenticates using a SASL mechanism.
//
// Email servers manage a message queue, from which they will try to deliver
// messages. In case of temporary failures, the message is kept in the queue and
// tried again later. For delivery, no authentication is done. TLS is opportunistic
// by default (TLS certificates not verif

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