Spamhaus PBL block on dynamic IP
We recently dropped our static IP. Our self-hosted PBX cannot email our Microsoft-hosted accounts because our Comcast IP is listed on the *residential* Spamhaus PBL.
5.7.1 Service unavailable, Client host [126.96.36.199] blocked using Spamhaus. To request removal from this list see https://www.spamhaus.org/query/ip/188.8.131.52 AS(1450) (in reply to RCPT TO command)
The instructions at Spamhaus are to email firstname.lastname@example.org - an account that doesn't exist. For residential customers, the key is to complete this form, which results in an email letting us know our IP isn't listed: https://spa.xfinity.com/report
Business internet support and these forums historically say to contact the Security Response Team at 888-565-4329. The SRT says this goes to the business internet support team. I've called them enough that I've unfortunately memorized my 16-digit Comcast account number.
Does anyone have a clue who to connect with?