After answering to the initial confirmation mail (Subject: Please
confirm (conf#60...)), the recipient should receive another mail
telling him that his address has been added to the whitelist and that
his mails have been delivered (evtl. with a list of these mails
with subject and date).
For example like the TMDA confirmation message:
Subject: Confirmation accepted
This message was created automatically by mail delivery software.
Your confirmation was accepted, and so your original message has