Solution to PHPmail failure in sending mails via SMTP in Windows

When debugging the WordPress mail sending function today, the message "SMTPserverresponse: 5015.5.4InvalidAddress" is always displayed. Using telnet to test SMTP is not a problem because it must be in the php mail sending class of WordPress. Easy to Google to the cause: the original Windows SMTP service does not support Mail format such as Name, must be directly written as a address@domain.com. So I put this line in WordPress's class-phpmailer.php
The code is as follows:
$ From [0] [1] = $ this-> FromName;

It will be OK if you comment it out.