Email error 550 Invalid recipient

[cliffcc]

I have installed the smtp server and Xampp

Warning: mail() [function.mail]: SMTP server response: 550 Invalid recipient: [e-mail] in C:\xampp\htdocs\emailtesting.php on line 4

<?php

ini_set("sendmail_from","[e-mail]"); 
mail("[e-mail]","Success","Thanks", "From: [e-mail]");

?>

[KamranArshad]

invalid email address

[Wraithmanilian]

Try removing the default sender (sendmail_from) in your php.ini. That has helped my friends in the past.

[cliffcc]

[mail function]
; For Win32 only.
; http://php.net/smtp
SMTP = localhost
; http://php.net/smtp-port
smtp_port = 25

; For Win32 only.
; http://php.net/sendmail-from
;sendmail_from = [e-mail]

I have removed the last three lines, but it is not work! Thanks!