wp_mail() do not sent mail to the addresses ended by @qq.com

[syshut]

<?php
function comment_mail_notify() {
        $to = 'xxxx@qq.com';
        $subject = 'subject';
        $message = 'message';
        $headers = 'xxxx';
        wp_mail( $to, $subject, $message, $headers );
}
add_action( 'comment_post', 'comment_mail_notify' );

When there is a new comment, wp_mail() sends an email to the email address defined in the $to parameter.

If the email address is ended by @qq.com , wp_mail() do not send the email. But other addresses, like xxxx@live.com, or xxxx@gmail.com, wp_mail() works.

Is there something wrong with this function?

[SergeyBiryukov]

Hi there, welcome to WordPress Trac! Thanks for the report.

There are no restrictions like that in WordPress core, it sends emails to any address in the same way. Successful delivery may depend on a number of factors:

• Spam filters.
• Hosting settings.
• Mail service settings.
• Whether the host is blacklisted on that mail service.
• etc.

Please try the support forums for further troubleshooting: ​https://wordpress.org/support/forums/

This support article might also be helpful: ​https://wordpress.org/support/article/faq-troubleshooting/#emailed-passwords-are-not-being-received