Email sending problems after fsockopen () is disabled

WordPress's email sending function has always been implemented by plug-ins.

After changing to a host provider, you will find that you cannot send an email. If you use WP-mail-SMTP to send a test email, the following error message is displayed: SMTP-> error: failed to connect to server :()

One day later, I found that the fsockopen function was disabled.

Find WP-nodes des/class. SMTP. php, row 174

$ This-> smtp_conn = @ fsockopen ($ host, $ port, $ errno, $ errstr, $ tval );

Change

$ This-> smtp_conn = @ pfsockopen ($ host, $ port, $ errno, $ errstr, $ tval );

After replacement, it fails again, and the pfsockopen function is disabled, and changed

$ This-> smtp_conn = @ stream_socket_client ("TCP: //". $ host. ":". $ port, $ errno, $ errstr, $ tval );

OK. You can send emails this time.