I have a newsletter system that i was using phpmailer to send, and it's to the point now where I can't take phpmailer's flakyness anymore. It's a real crap shoot as to which silly errors are going to choke it.
I had an issue with it yesterday where I reverted to using php's mail(). I know i was told before that using mail() was a no no, but it sent my 900 email no problem and in about half the time phpmailer was taking.
php.net suggests using PEAR:mail for sending out bulk mail but doesnt say why. I don't want to have to cross my fingers everytime I need to send out newsletters.