rmpel

<?php
/**
 * Restore CSV upload functionality for WordPress 4.9.9 and up
 */
add_filter('wp_check_filetype_and_ext', function($values, $file, $filename, $mimes) {
	if ( extension_loaded( 'fileinfo' ) ) {
		// with the php-extension, a CSV file is issues type text/plain so we fix that back to 
		// text/csv by trusting the file extension.
		$finfo     = finfo_open( FILEINFO_MIME_TYPE );
		$real_mime = finfo_file( $finfo, $file );

jaredatch

Install MailHog with MAMP Pro, using HomeBrew.

MailHog

First let's make sure HB is updated. Open up terminal for the following steps.

$ brew update