Back tracking subscribers confirmations

Hi,
I'm about to install mailman for a friend of mine, basically he runs a motivation company (yes the one that employers send their staff onto to try to get them to enjoy and be motivated in their £4.50 an hour telesales job).
Basically he wishes send mails out informing subscribers of new deals and seminares etc..
So I decided to take charge and build him a two machines, web server, email server and hopefully use mailman to send out these mails, on one condition, that anyone who he wants to send a mail *MUST* subscribe of their own free will (or I will literley delete his entire harddrive on all the servers, as I don't want mailman or Linux assosiated with being responsable for spamming, as I will be maintaining the boxs).
Is it possable in mailman to keep track of all mail sent and received? ( I know sendmail, logs all transactions), so if someone complains to his ISP that they never asked for a mail, we can prove by going through mailmans archives or logs that yes they did and that we can provide the confirmation email from that users agreed to sign up to the list.
Thanks in advance
Mark
-- Eagles may soar.. But weasels don't get sucked into jet engines...
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Mark C