Re: Warning: mail(): SMTP server response: 550 Unable to relay

php wrote:

I'm fairly new to php and I'm trying to setup mail functionality from php on IIS 4.0. I keep getting this error. I have tried ever combination for the SMTP settings in the php.ini file, but nothing seems to work. I can send mail using CDONTS on this server, but using php I cannot <?php mail("pmerrigan@mnhospitals.org", "My Subject", "Some info") ?> chances are that your smtp needs to authenticate the sender. you notice that the mail() function does not have a username and password parameters.

you will need use an smtp class that can authenticate. and you'll be fine. try one of these: http://www.phpclasses.org/search.html?words=smtp&go_search=1 -- Leo G. Divinagracia III ldivinag@csuhayward.edu zzzzz