Filters the wp_mail() content type.

Parameters

$content_typestring

Default wp_mail() content type.

More Information

• The default content type for email sent through the wp_mail() function is ‘text/plain‘ which does not allow using HTML. However, you can use the wp_mail_content_type filter to change the default content type of the email.
• In general, content type is going to be ‘text/plain‘ as the default, or ‘text/html‘ for HTML email; but other MIME types are possible.

Source

$content_type = apply_filters( 'wp_mail_content_type', $content_type );

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