I have a form on my website where the user registers his account, including email address. Once he submits the form, PHP executes the mail() function to send a confirmation email. However, if the user inputted an invalid address, the error message appears at the top of the page: "Warning: mail(): SMTP server response: 550 Invalid recipient: blahblah@fdshjfs.com in...." I dont want the user to see this error message. I want to return a different error message and post it somewhere else on the page, such as "Invalid email address.". How can I make it so that mail() does not echo the error message to the immediete frame?