Please note: This hack is obsolete from simpleContact Pro 2.02.
Version 2.02 includes an [email] merge tag for the autoresponder. simpleContact Pro license holders can get the latest version by following the instructions at the support centre.
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An implementation of custom merge tags for the autoresponder is planned for a future release of simpleContact Pro. In the meantime, it is a trivial task to add the ability to merge the submitted email address into the message.
Open sc_admin/include/contact.php
After line 285 add the following:
$responder_message = str_replace("[email]",$email,$responder_message);
Instances of [email] in your autoresponder message will be replaced with the submitted email address.