[PHP] Error when execute header('location: otherpage.php') after email been sent out. Any Workaround?

[Keith]

I have a user sign up page that collects sign up information from user with 
form.
This form will then be submitted to another process.php page for setting up 
the user account and send email to the user.
After the email been sent out, the user will be directed back to homepage 
with header("location: index.php").
However, error happen with warning: [Cannot modify header information - 
headers already sent by...]
Any workaround for this?

Thanks for help!
Keith


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