Re: Email Servers On Spamcop blacklist
Many automated lists expire blocks after some time, it saves having to administer removals.
Some do only clear it on request, and some (personal, not recommended for production use) make highly opinionate judgements on large address blocks and whole ISP's (actually, for personal use, blocking the entire APNIC administered address range and the entire 24.x.x.x US cable ISP range would nuke 99% of spam, though possibly some wanted stuff too).
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