Added support for SMTPS

Gomail now automatically uses SMTPS on port 465

README.md

@@ -15,6 +15,7 @@ It requires Go 1.2 or newer.
  * Supports HTML and text templates
  * Attachments
  * Embedded images
+ * SSL/TLS support
  * Automatic encoding of special characters
  * Well-documented
  * High test coverage

mailer.go

@@ -67,7 +67,7 @@ func NewMailer(host string, username string, password string, port int, settings
 //	gomail.NewCustomMailer("host:587", smtp.CRAMMD5Auth("username", "secret"))
 func NewCustomMailer(addr string, auth smtp.Auth, settings ...MailerSetting) *Mailer {
 	// Error is not handled here to preserve backward compatibility
-	host, _, _ := net.SplitHostPort(addr)
+	host, port, _ := net.SplitHostPort(addr)
 
 	m := &Mailer{
 		addr: addr,
@@ -83,7 +83,7 @@ func NewCustomMailer(addr string, auth smtp.Auth, settings ...MailerSetting) *Ma
 		m.config = &tls.Config{ServerName: host}
 	}
 	if m.send == nil {
-		m.send = m.getSendMailFunc()
+		m.send = m.getSendMailFunc(port == "465")
 	}
 
 	return m

send.go

@@ -3,18 +3,22 @@ package gomail
 import (
 	"crypto/tls"
 	"io"
+	"net"
 	"net/smtp"
 )
 
-func (m *Mailer) getSendMailFunc() SendMailFunc {
+func (m *Mailer) getSendMailFunc(ssl bool) SendMailFunc {
 	return func(addr string, a smtp.Auth, from string, to []string, msg []byte) error {
-		c, err := initSMTP(addr)
+		var c smtpClient
+		var err error
+		if ssl {
+			c, err = sslDial(addr, m.host, m.config)
+		} else {
+			c, err = starttlsDial(addr, m.config)
+		}
 		if err != nil {
 			return err
 		}
-		if ok, _ := c.Extension("STARTTLS"); ok {
-			return c.StartTLS(m.config)
-		}
 		defer c.Close()
 
 		if a != nil {
@@ -52,10 +56,40 @@ func (m *Mailer) getSendMailFunc() SendMailFunc {
 	}
 }
 
+func sslDial(addr, host string, config *tls.Config) (smtpClient, error) {
+	conn, err := initTLS("tcp", addr, config)
+	if err != nil {
+		return nil, err
+	}
+
+	return newClient(conn, host)
+}
+
+func starttlsDial(addr string, config *tls.Config) (smtpClient, error) {
+	c, err := initSMTP(addr)
+	if err != nil {
+		return c, err
+	}
+
+	if ok, _ := c.Extension("STARTTLS"); ok {
+		return c, c.StartTLS(config)
+	}
+
+	return c, nil
+}
+
 var initSMTP = func(addr string) (smtpClient, error) {
 	return smtp.Dial(addr)
 }
 
+var initTLS = func(network, addr string, config *tls.Config) (*tls.Conn, error) {
+	return tls.Dial(network, addr, config)
+}
+
+var newClient = func(conn net.Conn, host string) (smtpClient, error) {
+	return smtp.NewClient(conn, host)
+}
+
 type smtpClient interface {
 	Extension(string) (bool, string)
 	StartTLS(*tls.Config) error

send_test.go

@@ -3,12 +3,15 @@ package gomail
 import (
 	"crypto/tls"
 	"io"
+	"net"
 	"net/smtp"
 	"testing"
 )
 
 var (
 	testAddr    = "smtp.example.com:587"
+	testSSLAddr = "smtp.example.com:465"
+	testTLSConn = &tls.Conn{}
 	testConfig  = &tls.Config{InsecureSkipVerify: true}
 	testHost    = "smtp.example.com"
 	testAuth    = smtp.PlainAuth("", "user", "pwd", "smtp.example.com")
@@ -43,6 +46,21 @@ func TestDefaultSendMail(t *testing.T) {
 	})
 }
 
+func TestSSLSendMail(t *testing.T) {
+	testSendMail(t, testSSLAddr, nil, []string{
+		"Extension AUTH",
+		"Auth",
+		"Mail " + testFrom,
+		"Rcpt " + testTo[0],
+		"Rcpt " + testTo[1],
+		"Data",
+		"Write message",
+		"Close writer",
+		"Quit",
+		"Close",
+	})
+}
+
 func TestTLSConfigSendMail(t *testing.T) {
 	testSendMail(t, testAddr, testConfig, []string{
 		"Extension STARTTLS",
@@ -60,6 +78,21 @@ func TestTLSConfigSendMail(t *testing.T) {
 	})
 }
 
+func TestTLSConfigSSLSendMail(t *testing.T) {
+	testSendMail(t, testSSLAddr, testConfig, []string{
+		"Extension AUTH",
+		"Auth",
+		"Mail " + testFrom,
+		"Rcpt " + testTo[0],
+		"Rcpt " + testTo[1],
+		"Data",
+		"Write message",
+		"Close writer",
+		"Quit",
+		"Close",
+	})
+}
+
 type mockClient struct {
 	t      *testing.T
 	i      int
@@ -152,6 +185,25 @@ func testSendMail(t *testing.T, addr string, config *tls.Config, want []string)
 		return testClient, nil
 	}
 
+	initTLS = func(network, addr string, config *tls.Config) (*tls.Conn, error) {
+		if network != "tcp" {
+			t.Errorf("Invalid network, got %q, want tcp", network)
+		}
+		assertAddr(t, addr, testClient.addr)
+		assertConfig(t, config, testClient.config)
+		return testTLSConn, nil
+	}
+
+	newClient = func(conn net.Conn, host string) (smtpClient, error) {
+		if conn != testTLSConn {
+			t.Error("Invalid TLS connection used")
+		}
+		if host != testHost {
+			t.Errorf("Invalid host, got %q, want %q", host, testHost)
+		}
+		return testClient, nil
+	}
+
 	msg := NewMessage()
 	msg.SetHeader("From", testFrom)
 	msg.SetHeader("To", testTo...)