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// Package smtp implements the Simple Mail Transfer Protocol as defined in RFC 5321.
//
// It also implements the following extensions:
//
// - 8BITMIME (RFC 1652)
// - ENHANCEDSTATUSCODES (RFC 2034)
// - AUTH (RFC 2554)
// - DELIVERBY (RFC 2852)
// - CHUNKING (RFC 3030)
// - BINARYMIME (RFC 3030)
// - STARTTLS (RFC 3207)
// - DSN (RFC 3461, RFC 6533)
// - SMTPUTF8 (RFC 6531)
// - MT-PRIORITY (RFC 6710)
// - RRVS (RFC 7293)
// - REQUIRETLS (RFC 8689)
//
// LMTP (RFC 2033) is also supported.
//
// Additional extensions may be handled by other packages.
package smtp
import (
"time"
)
type BodyType string
const (
Body7Bit BodyType = "7BIT"
Body8BitMIME BodyType = "8BITMIME"
BodyBinaryMIME BodyType = "BINARYMIME"
)
type DSNReturn string
const (
DSNReturnFull DSNReturn = "FULL"
DSNReturnHeaders DSNReturn = "HDRS"
)
// MailOptions contains parameters for the MAIL command.
type MailOptions struct {
// Value of BODY= argument, 7BIT, 8BITMIME or BINARYMIME.
Body BodyType
// Size of the body. Can be 0 if not specified by client.
Size int64
// TLS is required for the message transmission.
//
// The message should be rejected if it can't be transmitted
// with TLS.
RequireTLS bool
// The message envelope or message header contains UTF-8-encoded strings.
// This flag is set by SMTPUTF8-aware (RFC 6531) client.
UTF8 bool
// Value of RET= argument, FULL or HDRS.
Return DSNReturn
// Envelope identifier set by the client.
EnvelopeID string
// The authorization identity asserted by the message sender in decoded
// form with angle brackets stripped.
//
// nil value indicates missing AUTH, non-nil empty string indicates
// AUTH=<>.
//
// Defined in RFC 4954.
Auth *string
}
type DSNNotify string
const (
DSNNotifyNever DSNNotify = "NEVER"
DSNNotifyDelayed DSNNotify = "DELAY"
DSNNotifyFailure DSNNotify = "FAILURE"
DSNNotifySuccess DSNNotify = "SUCCESS"
)
type DSNAddressType string
const (
DSNAddressTypeRFC822 DSNAddressType = "RFC822"
DSNAddressTypeUTF8 DSNAddressType = "UTF-8"
)
type DeliverByMode string
const (
DeliverByNotify DeliverByMode = "N"
DeliverByReturn DeliverByMode = "R"
)
type DeliverByOptions struct {
Time time.Duration
Mode DeliverByMode
Trace bool
}
type PriorityProfile string
const (
PriorityUnspecified PriorityProfile = ""
PriorityMIXER PriorityProfile = "MIXER"
PrioritySTANAG4406 PriorityProfile = "STANAG4406"
PriorityNSEP PriorityProfile = "NSEP"
)
// RcptOptions contains parameters for the RCPT command.
type RcptOptions struct {
// Value of NOTIFY= argument, NEVER or a combination of either of
// DELAY, FAILURE, SUCCESS.
Notify []DSNNotify
// Original recipient set by client.
OriginalRecipientType DSNAddressType
OriginalRecipient string
// Time value of the RRVS= argument
// or the zero time if unset.
RequireRecipientValidSince time.Time
// Value of BY= argument or nil if unset.
DeliverBy *DeliverByOptions
// Value of MT-PRIORITY= or nil if unset.
MTPriority *int
}
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