Redirect if Message sent success

Hey. how can I let my page redirect automatically after a message has been set successfully instead of just receiving:

$Messages->add( T_('Your message has been sent.'), 'success' );

add something like this right below the message string

header_redirect('http://myurl.tld');

In 6.7.0 at least:

if you're not logged in, you're redirected to the homepage after your message is sent.
if you're logged, you will probably se sending a Private message and you'll be redirected to your conversations list.

Did you want something more specific redirect? (please describe use case)

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