Email problem

[oureverie]

i have a registration form using php for user to submit. upon submission, i send them an email on the confirmation. i want the sender email to be a specific one and i've tried putting it in the header of the php, but the sender email that appears is "accountname@boxXXX.bluehost.com" instead. this happens for all my domain that's in my bluehost account. can anyone advise on how do i change it to a from address that i like? thanks.

[farcaster]

Have you created the email address in the cPanel?