Error: Suspicious SenderBase Reputation Score
Our inbound mail servers use IronPort's SenderBase network to determine how to treat incoming SMTP connections. For each IP address it knows about, the SenderBase network assigns a reputation score, ranging from -10.0 to +10.0. Negative reputation scores are bad, and positive reputation scores are good. Our system then classifies each incoming SMTP connection based on the reputation score for that IP address.
Note: ITS does not publicly document the exact ranges of reputation scores used to classify connections because they are subject to change.
Servers with reputation scores in the middle of the negative range are subject to a rate limit of one recipient per hour. If your server falls into this category, please check with SenderBase for information about your server's IP address, including any publicly available blacklists that it may be on. If SenderBase does not list any immediately apparent reason for your server's poor reputation, then you may contact the UT Service Desk to request that your server be exempted from this reputation check. Requests to the Help and Service Desk should include the IP address(es) of affected server(s), as well as the date and approximate time, including time zone, of the most recent incident.