Module async_smtp::smtp

The SMTP transport sends emails using the SMTP protocol.

This SMTP client follows RFC 5321, and is designed to efficiently send emails from an application to a relay email server, as it relies as much as possible on the relay server for sanity and RFC compliance checks.

It implements the following extensions:

• 8BITMIME (RFC 6152)
• AUTH (RFC 4954) with PLAIN, LOGIN and XOAUTH2 mechanisms
• STARTTLS (RFC 2487)
• SMTPUTF8 (RFC 6531)

Modules

authentication	Provides limited SASL authentication mechanisms
client	SMTP client
commands	SMTP commands
error	Error and result type for SMTP clients
extension	ESMTP features
response	SMTP response, containing a mandatory return code and an optional text message
util	Utils for string manipulation

Structs

SmtpClient	Contains client configuration
SmtpTransport	Structure that implements the high level SMTP client

Enums

ClientSecurity	How to apply TLS to a client connection
ConnectionReuseParameters	Configures connection reuse behavior

Constants

SMTP_PORT	Default smtp port
SUBMISSIONS_PORT	Default submission over TLS port
SUBMISSION_PORT	Default submission port