Does the Policy Block List (PBL) only contain dynamic IP ranges?

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Does the Policy Block List (PBL) only contain dynamic IP ranges?

The Policy Block List (PBL) is a list of IP space that should not be sending email directly to the Internet/direct-to-MX: often these are IP ranges assigned by ISPs to broadband or dial-up customers, but PBL does include other types of IP space.

Any IP space that should not be sending email directly to the Internet should be listed in PBL.

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