auth.go

@@ -35,7 +35,7 @@ const (
 	// IETF draft. The IETF draft is more lax than the MS spec, therefore we follow the I-D, which
 	// automatically matches the MS spec.
 	//
-	// Since the "LOGIN" SASL authentication mechanism transmits the username and password in
+	// Since the "LOGIN" SASL authentication mechansim transmits the username and password in
 	// plaintext over the internet connection, we only allow this mechanism over a TLS secured
 	// connection.
 	//
@@ -47,11 +47,11 @@ const (
 	// SMTPAuthNoAuth is equivalent to performing no authentication at all. It is a convenience
 	// option and should not be used. Instead, for mail servers that do no support/require
 	// authentication, the Client should not be passed the WithSMTPAuth option at all.
-	SMTPAuthNoAuth SMTPAuthType = "NOAUTH"
+	SMTPAuthNoAuth SMTPAuthType = ""
 
 	// SMTPAuthPlain is the "PLAIN" authentication mechanism as described in RFC 4616.
 	//
-	// Since the "PLAIN" SASL authentication mechanism transmits the username and password in
+	// Since the "PLAIN" SASL authentication mechansim transmits the username and password in
 	// plaintext over the internet connection, we only allow this mechanism over a TLS secured
 	// connection.
 	//
@@ -76,7 +76,7 @@ const (
 	//
 	// SCRAM-SHA-X-PLUS authentication require TLS channel bindings to protect against MitM attacks and
 	// to guarantee that the integrity of the transport layer is preserved throughout the authentication
-	// process. Therefore we only allow this mechanism over a TLS secured connection.
+	// process. Therefore we only allow this mechansim over a TLS secured connection.
 	//
 	// SCRAM-SHA-1-PLUS is still considered secure for certain applications, particularly when used as part
 	// of a challenge-response authentication mechanism (as we use it). However, it is generally
@@ -95,7 +95,7 @@ const (
 	//
 	// SCRAM-SHA-X-PLUS authentication require TLS channel bindings to protect against MitM attacks and
 	// to guarantee that the integrity of the transport layer is preserved throughout the authentication
-	// process. Therefore we only allow this mechanism over a TLS secured connection.
+	// process. Therefore we only allow this mechansim over a TLS secured connection.
 	//
 	// https://datatracker.ietf.org/doc/html/rfc7677
 	SMTPAuthSCRAMSHA256PLUS SMTPAuthType = "SCRAM-SHA-256-PLUS"

client.go

@@ -259,7 +259,6 @@ var (
 //   - An error if any critical default values are missing or options fail to apply.
 func NewClient(host string, opts ...Option) (*Client, error) {
 	c := &Client{
-		smtpAuthType: SMTPAuthNoAuth,
 		connTimeout: DefaultTimeout,
 		host:        host,
 		port:        DefaultPort,
@@ -1065,16 +1064,9 @@ func (c *Client) DialAndSendWithContext(ctx context.Context, messages ...*Msg) e
 // determines the supported authentication methods, and applies the appropriate authentication
 // type. An error is returned if authentication fails.
 //
-// By default NewClient sets the SMTP authentication type to SMTPAuthNoAuth, meaning, that no
+// This method first verifies the connection to the SMTP server. If no custom authentication
-// SMTP authentication will be performed. If the user makes use of SetSMTPAuth or initialzes the
+// mechanism is provided, it checks which authentication methods are supported by the server.
-// client with WithSMTPAuth, the SMTP authentication type will be set in the Client, forcing
+// Based on the configured SMTPAuthType, it sets up the appropriate authentication mechanism.
-// this method to determine if the server supports the selected authentication method and
-// assigning the corresponding smtp.Auth function to it.
-//
-// If the user set a custom SMTP authentication function using SetSMTPAuthCustom or
-// WithSMTPAuthCustom, we will not perform any detection and assignment logic and will trust
-// the user with their provided smtp.Auth function.
-//
 // Finally, it attempts to authenticate the client using the selected method.
 //
 // Returns:
@@ -1084,8 +1076,7 @@ func (c *Client) auth() error {
 	if err := c.checkConn(); err != nil {
 		return fmt.Errorf("failed to authenticate: %w", err)
 	}
-
+	if c.smtpAuth == nil && c.smtpAuthType != SMTPAuthCustom {
-	if c.smtpAuth == nil && c.smtpAuthType != SMTPAuthNoAuth {
 		hasSMTPAuth, smtpAuthType := c.smtpClient.Extension("AUTH")
 		if !hasSMTPAuth {
 			return fmt.Errorf("server does not support SMTP AUTH")

client_test.go

@@ -1180,81 +1180,6 @@ func TestClient_Send_withBrokenRecipient(t *testing.T) {
 	}
 }
 
-func TestClient_DialWithContext_switchAuth(t *testing.T) {
-	if os.Getenv("TEST_ALLOW_SEND") == "" {
-		t.Skipf("TEST_ALLOW_SEND is not set. Skipping mail sending test")
-	}
-
-	// We start with no auth explicitly set
-	client, err := NewClient(
-		os.Getenv("TEST_HOST"),
-		WithTLSPortPolicy(TLSMandatory),
-	)
-	defer func() {
-		_ = client.Close()
-	}()
-	if err != nil {
-		t.Errorf("failed to create client: %s", err)
-		return
-	}
-	if err = client.DialWithContext(context.Background()); err != nil {
-		t.Errorf("failed to dial to sending server: %s", err)
-	}
-	if err = client.Close(); err != nil {
-		t.Errorf("failed to close client connection: %s", err)
-	}
-
-	// We switch to LOGIN auth, which the server supports
-	client.SetSMTPAuth(SMTPAuthLogin)
-	client.SetUsername(os.Getenv("TEST_SMTPAUTH_USER"))
-	client.SetPassword(os.Getenv("TEST_SMTPAUTH_PASS"))
-	if err = client.DialWithContext(context.Background()); err != nil {
-		t.Errorf("failed to dial to sending server: %s", err)
-	}
-	if err = client.Close(); err != nil {
-		t.Errorf("failed to close client connection: %s", err)
-	}
-
-	// We switch to CRAM-MD5, which the server does not support - error expected
-	client.SetSMTPAuth(SMTPAuthCramMD5)
-	if err = client.DialWithContext(context.Background()); err == nil {
-		t.Errorf("expected error when dialing with unsupported auth mechanism, got nil")
-		return
-	}
-	if !errors.Is(err, ErrCramMD5AuthNotSupported) {
-		t.Errorf("expected dial error: %s, but got: %s", ErrCramMD5AuthNotSupported, err)
-	}
-
-	// We switch to CUSTOM by providing PLAIN auth as function - the server supports this
-	client.SetSMTPAuthCustom(smtp.PlainAuth("", os.Getenv("TEST_SMTPAUTH_USER"),
-		os.Getenv("TEST_SMTPAUTH_PASS"), os.Getenv("TEST_HOST")))
-	if client.smtpAuthType != SMTPAuthCustom {
-		t.Errorf("expected auth type to be Custom, got: %s", client.smtpAuthType)
-	}
-	if err = client.DialWithContext(context.Background()); err != nil {
-		t.Errorf("failed to dial to sending server: %s", err)
-	}
-	if err = client.Close(); err != nil {
-		t.Errorf("failed to close client connection: %s", err)
-	}
-
-	// We switch back to explicit no authenticaiton
-	client.SetSMTPAuth(SMTPAuthNoAuth)
-	if err = client.DialWithContext(context.Background()); err != nil {
-		t.Errorf("failed to dial to sending server: %s", err)
-	}
-	if err = client.Close(); err != nil {
-		t.Errorf("failed to close client connection: %s", err)
-	}
-
-	// Finally we set an empty string as SMTPAuthType and expect and error. This way we can
-	// verify that we do not accidentaly skip authentication with an empty string SMTPAuthType
-	client.SetSMTPAuth("")
-	if err = client.DialWithContext(context.Background()); err == nil {
-		t.Errorf("expected error when dialing with empty auth mechanism, got nil")
-	}
-}
-
 // TestClient_auth tests the Dial(), Send() and Close() method of Client with broken settings
 func TestClient_auth(t *testing.T) {
 	tests := []struct {

doc.go

@@ -11,4 +11,4 @@ package mail
 
 // VERSION indicates the current version of the package. It is also attached to the default user
 // agent string.
-const VERSION = "0.5.1"
+const VERSION = "0.5.0"

eml.go

@@ -383,7 +383,7 @@ ReadNextPart:
 		return fmt.Errorf("failed to get next part of multipart message: %w", err)
 	}
 	for err == nil {
-		// Multipart/related and Multipart/alternative parts need to be parsed separately
+		// Multipart/related and Multipart/alternative parts need to be parsed seperately
 		if contentTypeSlice, ok := multiPart.Header[HeaderContentType.String()]; ok && len(contentTypeSlice) == 1 {
 			contentType, _ := parseMultiPartHeader(contentTypeSlice[0])
 			if strings.EqualFold(contentType, TypeMultipartRelated.String()) ||

log/jsonlog.go

@@ -41,48 +41,42 @@ func NewJSON(output io.Writer, level Level) *JSONlog {
 	}
 }
 
-// logMessage is a helper function to handle different log levels and formats.
-func logMessage(level Level, log *slog.Logger, logData Log, formatFunc func(string, ...interface{}) string) {
-	lGroup := log.WithGroup(DirString).With(
-		slog.String(DirFromString, logData.directionFrom()),
-		slog.String(DirToString, logData.directionTo()),
-	)
-	switch level {
-	case LevelDebug:
-		lGroup.Debug(formatFunc(logData.Format, logData.Messages...))
-	case LevelInfo:
-		lGroup.Info(formatFunc(logData.Format, logData.Messages...))
-	case LevelWarn:
-		lGroup.Warn(formatFunc(logData.Format, logData.Messages...))
-	case LevelError:
-		lGroup.Error(formatFunc(logData.Format, logData.Messages...))
-	}
-}
-
 // Debugf logs a debug message via the structured JSON logger
 func (l *JSONlog) Debugf(log Log) {
 	if l.level >= LevelDebug {
-		logMessage(LevelDebug, l.log, log, fmt.Sprintf)
+		l.log.WithGroup(DirString).With(
+			slog.String(DirFromString, log.directionFrom()),
+			slog.String(DirToString, log.directionTo()),
+		).Debug(fmt.Sprintf(log.Format, log.Messages...))
 	}
 }
 
 // Infof logs a info message via the structured JSON logger
 func (l *JSONlog) Infof(log Log) {
 	if l.level >= LevelInfo {
-		logMessage(LevelInfo, l.log, log, fmt.Sprintf)
+		l.log.WithGroup(DirString).With(
+			slog.String(DirFromString, log.directionFrom()),
+			slog.String(DirToString, log.directionTo()),
+		).Info(fmt.Sprintf(log.Format, log.Messages...))
 	}
 }
 
 // Warnf logs a warn message via the structured JSON logger
 func (l *JSONlog) Warnf(log Log) {
 	if l.level >= LevelWarn {
-		logMessage(LevelWarn, l.log, log, fmt.Sprintf)
+		l.log.WithGroup(DirString).With(
+			slog.String(DirFromString, log.directionFrom()),
+			slog.String(DirToString, log.directionTo()),
+		).Warn(fmt.Sprintf(log.Format, log.Messages...))
 	}
 }
 
 // Errorf logs a warn message via the structured JSON logger
 func (l *JSONlog) Errorf(log Log) {
 	if l.level >= LevelError {
-		logMessage(LevelError, l.log, log, fmt.Sprintf)
+		l.log.WithGroup(DirString).With(
+			slog.String(DirFromString, log.directionFrom()),
+			slog.String(DirToString, log.directionTo()),
+		).Error(fmt.Sprintf(log.Format, log.Messages...))
 	}
 }

log/stdlog.go

@@ -35,36 +35,34 @@ func New(output io.Writer, level Level) *Stdlog {
 	}
 }
 
-// logStdMessage is a helper function to handle different log levels and formats for Stdlog.
-func logStdMessage(logger *log.Logger, logData Log, callDepth int) {
-	format := fmt.Sprintf("%s %s", logData.directionPrefix(), logData.Format)
-	_ = logger.Output(callDepth, fmt.Sprintf(format, logData.Messages...))
-}
-
 // Debugf performs a Printf() on the debug logger
 func (l *Stdlog) Debugf(log Log) {
 	if l.level >= LevelDebug {
-		logStdMessage(l.debug, log, CallDepth)
+		format := fmt.Sprintf("%s %s", log.directionPrefix(), log.Format)
+		_ = l.debug.Output(CallDepth, fmt.Sprintf(format, log.Messages...))
 	}
 }
 
 // Infof performs a Printf() on the info logger
 func (l *Stdlog) Infof(log Log) {
 	if l.level >= LevelInfo {
-		logStdMessage(l.info, log, CallDepth)
+		format := fmt.Sprintf("%s %s", log.directionPrefix(), log.Format)
+		_ = l.info.Output(CallDepth, fmt.Sprintf(format, log.Messages...))
 	}
 }
 
 // Warnf performs a Printf() on the warn logger
 func (l *Stdlog) Warnf(log Log) {
 	if l.level >= LevelWarn {
-		logStdMessage(l.warn, log, CallDepth)
+		format := fmt.Sprintf("%s %s", log.directionPrefix(), log.Format)
+		_ = l.warn.Output(CallDepth, fmt.Sprintf(format, log.Messages...))
 	}
 }
 
 // Errorf performs a Printf() on the error logger
 func (l *Stdlog) Errorf(log Log) {
 	if l.level >= LevelError {
-		logStdMessage(l.err, log, CallDepth)
+		format := fmt.Sprintf("%s %s", log.directionPrefix(), log.Format)
+		_ = l.err.Output(CallDepth, fmt.Sprintf(format, log.Messages...))
 	}
 }

smtp/auth_login.go

@@ -29,7 +29,7 @@ type loginAuth struct {
 // See: https://datatracker.ietf.org/doc/html/draft-murchison-sasl-login-00
 // Since there is no official standard RFC and we've seen different implementations
 // of this mechanism (sending "Username:", "Username", "username", "User name", etc.)
-// we follow the IETF-Draft and ignore any server challenge to allow compatibility
+// we follow the IETF-Draft and ignore any server challange to allow compatiblity
 // with most mail servers/providers.
 //
 // LoginAuth will only send the credentials if the connection is using TLS

smtp/smtp_test.go

@@ -2163,7 +2163,7 @@ func SkipFlaky(t testing.TB, issue int) {
 }
 
 // testSCRAMSMTPServer represents a test server for SCRAM-based SMTP authentication.
-// It does not do any acutal computation of the challenges but verifies that the expected
+// It does not do any acutal computation of the challanges but verifies that the expected
 // fields are present. We have actual real authentication tests for all SCRAM modes in the
 // go-mail client_test.go
 type testSCRAMSMTPServer struct {