redirect after send form to email with message

I want to redirect the user back to the home page after submitting
their form inquiry and display a message on the home page. I tried
this in my send mail (apply.php) file -

$_SESSION['sent_message'] == "Thank you for your request! Someone will
be contacting you soon.";
header("location:index.php");

but got this error -

Notice: Undefined index: sent_message in /home/bigmoxy/public_html/
projects/senior/apply.php on line 12

Warning: Cannot modify header information - headers already sent by
(output started at /home/bigmoxy/public_html/projects/senior/apply.php:
12) in /home/bigmoxy/public_html/projects/senior/apply.php on line 13

Note that the redirection works without setting the message.

Can someone please advise me on how to accomplish this?

Thank you!

Tim

.

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