DSPAM doesn't have a whitelist manager, rather whitelisting is an automatic function of DSPAM's Bayesian filtering mechanism. As you receive more emails from your colleagues, their from addresses and other identifying information (such as signatures) is automatically learned by DSPAM to create an internal whitelist. On top of this, DSPAM supports an automatic whitelisting feature which identifies individuals you converse with the most who have never sent spam.