// TestSMTP tests if can connect with the server and send some commands.
func TestSMTP(addr string, a smtp.Auth, hello string, timeout time.Duration, insecureSkipVerify bool) error {
serverName := addr
port := ""
s := strings.SplitN(addr, ":", 2)
if len(s) >= 2 {
serverName = s[0]
port = s[1]
}
if serverName == "" || port == "" {
return e.New("addrs is invalid")
}
hosts, err := dns.LookupHostCache(serverName)
if err != nil {
return e.Forward(err)
}
if len(hosts) == 0 {
return e.New("can't resolve the addr")
}
conn, err := net.DialTimeout("tcp", hosts[0]+":"+port, timeout)
if err != nil {
return e.Forward(err)
}
defer conn.Close()
command := &Command{
Timeout: timeout,
Conn: conn,
}
var c *smtp.Client
r := command.Exec(smtp.NewClient, conn, serverName)
r(&c, &err)
if err != nil {
return e.Forward(err)
}
defer c.Close()
if hello != "" {
r = command.Exec(c.Hello, hello)
r(&err)
if err != nil {
return e.Forward(err)
}
}
if ok, _ := c.Extension("STARTTLS"); ok {
r = command.Exec(c.StartTLS, &tls.Config{
ServerName: serverName,
InsecureSkipVerify: insecureSkipVerify,
})
r(&err)
if err != nil {
return e.Forward(err)
}
}
if a != nil {
found, _ := c.Extension("AUTH")
if found {
r = command.Exec(c.Auth, a)
r(&err)
if err != nil {
return e.Forward(err)
}
}
}
r = command.Exec(c.Reset)
r(&err)
if err != nil {
return e.New(err)
}
r = command.Exec(c.Quit)
r(&err)
if err != nil {
return e.New(err)
}
return nil
}
// SendMail send a message to specific destination (to) using smtp server in addrs
// and a auth.
func SendMail(addr string, a smtp.Auth, from string, to []string, hello string, msg []byte, timeout time.Duration, insecureSkipVerify bool) error {
serverName := addr
port := ""
serverName, port, err := net.SplitHostPort(addr)
if err != nil {
return e.Push(err, "invalid adderess")
}
if serverName == "" || port == "" {
return e.New("addrs is invalid")
}
hosts, err := dns.LookupHostCache(serverName)
if err != nil {
return e.Forward(err)
}
if len(hosts) == 0 {
return e.New("can't resolve the addr")
}
var conn net.Conn
for _, host := range hosts {
addr, err = utilNet.IpPort(host, port)
if err != nil {
err = e.Forward(err)
continue
}
conn, err = net.DialTimeout("tcp", addr, timeout)
if err != nil {
err = e.Forward(err)
continue
}
}
if conn == nil {
return err
}
command := &Command{
Timeout: timeout,
Conn: conn,
}
var c *smtp.Client
r := command.Exec(smtp.NewClient, conn, serverName)
r(&c, &err)
if err != nil {
return e.Forward(err)
}
defer c.Close()
if hello != "" {
r = command.Exec(c.Hello, hello)
r(&err)
if err != nil {
return e.Forward(err)
}
}
if ok, _ := c.Extension("STARTTLS"); ok {
r = command.Exec(c.StartTLS, &tls.Config{
ServerName: serverName,
InsecureSkipVerify: insecureSkipVerify,
})
r(&err)
if err != nil {
return e.Forward(err)
}
}
if a != nil {
found, _ := c.Extension("AUTH")
if found {
r = command.Exec(c.Auth, a)
r(&err)
if err != nil {
return e.Forward(err)
}
}
}
r = command.Exec(c.Mail, from)
r(&err)
if err != nil {
return e.Forward(err)
}
for _, addr := range to {
r = command.Exec(c.Rcpt, addr)
r(&err)
if err != nil {
return e.New(err)
}
}
var w io.WriteCloser
r = command.ExecTimeout(0, c.Data)
r(&w, &err)
if err != nil {
return e.New(err)
}
_, err = w.Write(msg)
if err != nil {
return e.New(err)
}
err = w.Close()
if err != nil {
return e.New(err)
}
r = command.Exec(c.Quit)
r(&err)
if err != nil {
return e.New(err)
}
return nil
}