Worse Email Practices for List Management
In the real world an email address is worth money to someone, if not to spammers then to marketers, and certainly to the list owner who keeps track of their subscriber’s demographics for targeted email campaigns.   Because of their value, email addresses maybe resold several times.

Selling email addresses is big business, and you’ll notice most of the email addresses for sale are touted as being opted-in.  However, when mailed to, you may find a good number of these purchased opted-in lists contain a large number of undeliverable addresses.  Without actually having control of your own email list collection procedure, which should include a confirmation process, purchased addresses could be harvested from web sites or gleaned out of mail servers.  They could be computer generated, or have spam traps waiting.  AND besides being unreliable, unverified and untargeted, the good addresses among the bad are probably filled with addresses that have been heavily marketed to, turning your response rate to zip.

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