What is the PBL?

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What is the PBL?

The Policy Blocklist (PBL) is a list of IP space that should not be sending email direct to MX: often these are IP ranges assigned by ISPs to broadband or dial-up customers, but the 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.

PBL listings do not prevent the sending of email unless the user’s email program is not authenticating correctly when connecting to their ISP or company’s mail server. Possible causes for this happening suddenly: changing email programs or changing settings on the existing one, forgetting to turn “SMTP Authentication” on, or switching “SMTP Authentication” off.

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