How can I avoid polluting databases of DCC servers with checksums of my mail that is not spam?
Reports of checksums with whitelist entries in your server’s database are not flooded to its peers. The checksums of messages whitelisted with entries in local dccm or dccproc whitelists are not reported to DCC servers. It is good to add entries to DCC server and client whitelists for localhost, your IP address blocks, and your domains if you know that none of your users will ever send spam. However, in the common mode in which the DCC is used, no checksums of mail are pollution. Checksums of genuinely private mail will have target counts of 1 or a small number, and so will not be flooded by your server to other servers. Strangers will not see your private mail and so will not be able to ask any DCC server about the checksums of your private mail. On the other hand, the DCC functions best by collecting reports of the receipt of bulk mail as soon as possible. That implies that it is generally desirable to send reports of all mail to a DCC server.
