Is there any reason I shouldn't use wp_mail to send emails for my newsletter plugin? Can it handle a large number of emails? Will it slow down page loads substantially?
Would a for loop sending each email individually be a bad idea?
If it's a bad idea I guess I can use the wp crons and set a cron job to run php /var/www/vhosts/mysite/httpdocs/index.php to ensure it is run at a minimum rate.