On Mon, Nov 14, 2022 at 04:08:28PM -0500, Alex wrote:
> I'm hoping I can ask this question here. Somehow the PBL considered the IP
> addresses given to us by our ISP (I can share this if needed) as ineligible
> to send email, resulting in any recipient domain that checks the PBL to
> reject our email, including every email sent to a Microsoft 365 domain.
> This is also despite having a rule to bypass spam filtering on the M365
> side with our own M365 domain - apparently that is not bypassed?
Generally, PBL listings are contributed by the responsible ISP, so it is
best to start with them. Sometimes community nominations are added to
the PBL of address blocks that look substantially like dynamic consumer
IPs. Perhaps that happened here. Yes, PBL false-positives can (rarely)
happen.
--
Viktor.
