Which of the following experts can help you with smtp mail? 503 Error: needEHLOandAUTHfirst

For smtp mail, who can help check the 503 Error: needEHLOandAUTHfirstResolvingSMTPserverdomain & quot; smtp.qq.com & quot ;... connectingtohostaddress & quot; 119.147.74.45 & quot; port25... connecte, who can help with smtp mail? 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 220 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 250 8 BITMIME
C mail from: <[email protected]>
C rcpt to: <[email protected]>
C DATA
S 503 Error: need EHLO and AUTH first!
Disconnected.
Cound not send the message to [email protected] Error: 503 Error: need EHLO and AUTH first!

------ Solution --------------------
You need to log in before sending an email
Have you sent the login information to the smtp.qq.com server?
------ Solution --------------------
1) Check whether the POP/SMTP function of your QQ mailbox is enabled?
2) it is possible that your program has been logged on multiple times and is rejected by the QQ mailbox as a malicious login. try another email.
3) paste your code, otherwise others do not know how to help you check
------ Solution --------------------
It is very likely that your QQ mailbox settings are incorrect .. check that pop3 and smtp services have been activated.
------ Solution --------------------
Need EHLO and AUTH first!

Isn't that clear?
You must shake hands first and request to log in.

PHP code

If (! $ Fp = fsockopen ($ this-> smtp ['host'], $ this-> smtp ['port'], $ errno, $ errstr )) {$ this-> message [] = "an error occurred while connecting to the email server. check whether \ r \ n1, server address, and port are set correctly! \ R \ n2, whether the network is smooth! "; Return false;} if (strncmp (fgets ($ fp, 512), '123', 3 )! = 0) {$ this-> message [] = "an error occurred while connecting to the email server. check whether \ r \ n1, server address, and port are set correctly! \ R \ n2, whether the network is smooth! "; Return false;} if ($ this-> smtp ['auth ']) {fwrite ($ fp," EHLO ". $ this-> smtp ['posthost']. "\ r \ n"); while ($ rt = strtolower (fgets ($ fp, 512) {if (strpos ($ rt ,"-")! = 3 | empty ($ rt) {break;} elseif (strpos ($ rt, "2 ")! = 0) {$ this-> message = "an error occurred while handshaking with the server"; return false ;}} fwrite ($ fp, "auth login \ r \ n "); if (strncmp (fgets ($ fp, 512), '20140901', 3 )! = 0) {$ this-> message = "an error occurred while prompting the server to log on for verification"; return false;} fwrite ($ fp, base64_encode ($ this-> smtp ['user']). "\ r \ n"); if (strncmp (fgets ($ fp, 512), '123', 3 )! = 0) {$ this-> message = "smtp auth login authentication username error! "; Return false;} fwrite ($ fp, base64_encode ($ this-> smtp ['pass']). "\ r \ n"); if (strncmp (fgets ($ fp, 512), '123', 3 )! = 0) {$ this-> message = "smtp auth login verification 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 (fgets ($ fp, 512), '20140901', 3 )! = 0) {$ this-> message = "the sender address is incorrect! "; Return false;} fwrite ($ fp," rcpt to: <$ toemail> \ r \ n "); if (strncmp (fgets ($ fp, 512 ), '123', 3 )! = 0) {$ this-> message = "the recipient's address is incorrect! "; Return false;} fwrite ($ fp," DATA \ r \ n "); if (strncmp (fgets ($ fp, 512), '123', 3 )! = 0) {$ this-> message = "failed to send email data! "; 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 )! = 250) {$ this-> message = "an error occurred while connecting to the email server. check whether \ r \ n1, server address, and port are set correctly! \ R \ n2, whether the network is smooth! "; Return false;} fwrite ($ fp," QUIT \ r \ n "); fclose ($ fp); return true;