I'm having trouble sending email to several state level organizations. My email bounces because "Your access to this mail system has been rejected du e to the sending MTA's poor reputation."
I've been around the loop on this. My hosting provider (who I use for send ing email) says there are no reports of problems and they are not "blacklis ted". I used the link provided in the bounce email and found that Cisco li sts the IP in question as having a "poor" reputation. When I search online the only issues I can find are from 2016 when spam was being sent. I file d a dispute with Cisco and their response sounded canned saying "Our worldw ide sensor network indicates that spam originated from your IP" and further , "our sensors indicate server access attempts from this IP to mail servers within our Sensor Network"
I've asked them for details since this is not nearly enough info to challen ge. Meanwhile I've sent this email on to my hosting provider so they can s ee there is at least one significant organization that does not list them a s squeaky clean.
It seems crazy that a company can publish such reports without a way to ver ify or challenge the accuracy of the reports. They at least need to provid e enough info that the system operators can attempt to take action against those who are causing the problems.