Today I got a bounce due to one of CIO’s broadcast sending IP’s being blacklisted. I thought the deliverability team managing the shared IP’s would want to know, but am not sure how to inform them. Also are there any workarounds I can do on my end? Thanks!
Here was the error:
sip.invaluement.mimecast.org Blocked by ivmSIP and/or ivmSIP/24 - see https://www.invaluement.com/lookup/?item=198.244.52.4. - https://community.mimecast.com/docs/DOC-1369#550 [rl4gU84TO7ml-DrNJ6SiLQ.usb12]