Sending multipart (text/html) emails via wp_mail() will likely get your domain banned
The following version of wp_mail() is with the patch applied of @rmccue/@MattyRob in the ticket https://core.trac.wordpress.org/ticket/15448, refreshed for 4.2.2, which allows $message to be an array containing content-type keyed alternates: /** * Send mail, similar to PHP’s mail * * A true return value does not automatically mean that the user received the * email … Read more