Hi I put this function on the functions.php or in a plugin and works for me everywhere, on localhost or in any server. just need to change the strings to your email smtp settings. Only with gmail I could not make it work so far, all the other ones I try it works perfectly.
// Overriding wp smtp email to send smtp emails (no spam emails)
if (! function_exists('email_sender')){
add_action('phpmailer_init','email_sender');
function email_sender($mail){
$mail->SetFrom('[email protected]', 'thenameIwant to appear on the emails sended');
$mail->Host="smtp-mail.outlook.com";
$mail->Port = 587;
$mail->SMTPAuth = true;
$mail->SMTPSecure="STARTTLS";
$mail->Username="[email protected]";
$mail->Password = 'mypassword';
$mail->IsSMTP();
}
}
then email should work like a charm! I normally use wp_mail() to do it.