Error: Questionable SenderBase Reputation Score
Our inbound mail servers use IronPort's SenderBase network to make a determination for 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.
Note: ITS does not publicly document the exact ranges of reputation scores used to classify connections because they are subject to change.
Servers with slightly negative reputation scores are subjected to a rate limit of 10 recipients per hour. If your server falls into this category, please check with SenderBase for information about your server's IP address. If SenderBase does not list any immediately apparent reason for your server's questionable reputation, then you may contact the ITS Help Desk to request that your server be exempted from this reputation check.
