SMTP sends messages always error how to handle

What happens when SMTP sends a message always wrong?
I want to use SMTP to send mail activation account can always appear this problem I can't fix it.
------Solution--------------------
Did you send it successfully on your own test?

This looks pretty normal.

That's just not turning off the debug log, is it?

See if there's anything like log generation.

I use the Send mailbox is such a debugging
echo "Cause:". $this->smtp->logs;

You should have something like that, too.
------Solution--------------------
Reference:

reference: Did you send it successfully on your own test?

This looks pretty normal.

That's just not turning off the debug log, is it?

See if there's anything like log generation.

I use the Send mailbox is such a debugging
echo "Cause:". $this->smtp->logs;

You should have something like that, too.
The test did not send the success, can you say more understand? I still don't understand

.

This page is just a debug message I didn't see anything wrong to ask the master.
Here's what I got from somewhere else, my test is successful, it feels good, you can try

 $ip =$_server[' remote_addr '];
OK for the mailbox to send.
Include "smtp.class.php"; Send message classes that need to be included
$smtpserver = "smtp.163.com"; The address of your SMTP server
$smtpserver = ""; SMTP server address
$port = 25; The port of the SMTP server, typically 25
$smtpuser = ""; The user name of the SMTP server you are logged into
$smtppwd = ""; Your password to log on to the SMTP server
$mailtype = "HTML"; The type of message, the optional value is txt or HTML, TXT is a plain text message, HTML means a message in HTML format
$sender = "{$email}"; Sender Mailbox
sender, typically the same as the user name ($smtpuser) of the SMTP server you are logged on to, or it may fail to send because of the SMTP server's settings
$SMTP = new SMTP ($smtpserver, $port, False, $smtpuser, $smtppwd, $sender); When the third value is false, the message can be sent anonymously, $smtpuser, $smtppwd commented out
$smtp->debug = true; Whether to turn on debugging, only used when testing the program, when formally used, please do not comment out this line of comments will be a lot
$to = ""; Recipient mailbox
Ready-to-use mailboxes
$subject = "$time-($address)-$zixun 1"; Fill in the subject of the email here
$body = ""//the body content of the message is written here
$send = $smtp->sendmail ($to, $sender, $subject, $body, $mailtype); Send mail
?>


 If an error is encountered, the method of debugging before this paragraph has an else or something that can be sent without a successful code
echo "Cause:". $this->smtp->logs; Logs sent by SMTP are generated
?>

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