About SMTP email, which expert can help to see 503 error:need EHLO and AUTH first

About SMTP email, who can help see 503 error:need EHLO and AUTH first
Resolving SMTP Server domain "smtp.qq.com" ...
Connecting to host Address "119.147.74.45" port 25 ...
Connected to SMTP server "smtp.qq.com".
S esmtp4.qq.com Esmtp QQ Mail Server
C EHLO localhost
S 250-esmtp4.qq.com
S 250-pipelining
S 250-size 52428800
S 250-auth LOGIN
S 250-auth=login
S 8BITMIME
C MAIL from:<839325966@qq.com>
C RCPT to:<276190536@qq.com>
C DATA
S 503 Error:need EHLO and AUTH first!
Disconnected.
Cound not send the message to 276190536@qq.com. error:503 error:need EHLO and AUTH first!

------Solution--------------------
Login required before sending mail
Did you send a login message to the smtp.qq.com server?
------Solution--------------------
1) Check your QQ mailbox POP/SMTP function has not opened?
2) It is possible that your program multiple login, QQ mailbox as a malicious login to refuse, change other mailbox send try.
3) put out your code, or else people won't know how to help you check
------Solution--------------------
It is possible that your QQ mailbox is set incorrectly. See if the POP3 and SMTP services are enabled.
------Solution--------------------
Need EHLO and AUTH first!

Doesn't that make it clear?
To greet the handshake first, and request to login.

PHP Code

if (! $fp =fsockopen ($this->smtp[' host '), $this->smtp[' Port '], $errno, $errstr)) {$this->message[]= "connection mail server lost Fail, please check: \r\n1, server address and port are set correctly! \R\N2, network is unobstructed!            ";        return false; } if (strncmp ($fp, fgets), ' 3 ',!=0) {$this->message[]= "failed to connect to the mail server, please check: \r\n1, server address and port are set correctly! \R\N2, network is unobstructed!            ";        return false; } if ($this->smtp[' auth ') {fwrite ($fp, "EHLO". $this->smtp[' Posthost ']. "            \ r \ n ");                while ($rt =strtolower ($fp, fgets)) {if (Strpos ($rt, "-")!==3 | | empty ($RT)) {break;                    }elseif (Strpos ($rt, "2")!==0) {$this->message= "error in greeting handshake with server";                return false;            }} fwrite ($fp, "AUTH login\r\n");                if (strncmp ($fp, fgets, ' 334 ', 3)!=0) {$this->message= "prompt the server to log in to verify the error";            return false; } fwrite ($FP, Base64_encode ($this->smtp[' user ')."\ r \ n"); if (strncmp ($fp, fgets), ' 334 ', 3)!=0) {$this->message= "SMTP AUTH LOGIN authentication username Error!                ";            return false; } fwrite ($FP, Base64_encode ($this->smtp[' Pass '). "            \ r \ n "); if (strncmp ($fp, fgets), ' 235 ', 3)!=0) {$this->message= "SMTP AUTH LOGIN authentication password Error!                ";            return false; }} else{fwrite ($fp, "HELO". $this->smtp[' Posthost ']. "        \ r \ n ");        } $from = $this->smtp[' from ']; $from = Preg_replace ("/.*\< (. +?)        \>.*/"," \\1 ", $from);        Fwrite ($fp, "MAIL from: < $from >\r\n"); if (strncmp ($fp, fgets), ' 3 ',!=0) {$this->message= "sender address Error!            ";        return false;        } fwrite ($FP, "RCPT to: < $toemail >\r\n"); if (strncmp ($fp, fgets), ' 3 ',!=0) {$this->message= "the delivery address is incorrect!            ";        return false;        } fwrite ($fp, "data\r\n"); if (strncmp (fgets ($FP, 512), ' 354 ', 3) (!=0) {$this->message= "mail data send failed!            ";        return false; } $msg = "Date:". Date ("R"). "        \ r \ n ";        $msg. = "Subject: $send _subject\r\n";        $msg. = "$additional \ r \ n";        $msg. = "$send _message\r\n.\r\n";        Fwrite ($fp, $msg);        $lastmessage = fgets ($FP, 512); if (substr ($lastmessage, 0, 3)! =) {$this->message= "failed to connect to the mail server, check: \r\n1, server address and port are set correctly! \R\N2, network is unobstructed!            ";        return false;        } fwrite ($fp, "quit\r\n");        Fclose ($FP);  return true;
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