ブロゴスフィア

某大学（医学部）のファイアウォール／サーバに Barracuda Reputation System が採用された。２週間前には送信できたが、先日、ホスティングによるメールサーバ（送信元）のIPアドレスを "poor" と評価されメール配信ブロック。
　http://www.barracudacentral.com/index.cgi?p=lookups

IP Lookup
The IP address *.*.*.* is listed as "poor" on the Barracuda Reputation System.
Domain Lookup
This domain is not listed on Barracuda's Intent Block List.

ホスティング・サーバのため（当該サーバ利用中の全ユーザーの行為を確認できないため）サーバ管理者に対応を依頼する。
メール配信ブロックの理由について(ホームページより)

We are sorry you have reached this page because an email was blocked based on its originating IP address having a "poor" reputation.

The "poor" reputation may have been caused by one of the following reasons:

   1. Your email server contains a virus and has been sending out spam.
   2. Your email server may be misconfigured.
   3. Your PC may be infected with a virus or botnet software program.
   4. Someone in your organization may have a PC infected with a virus or botnet program.
   5. You may be utilizing a dynamic IP address which was previously utilized by a known spammer.
   6. Your marketing department may be sending out bulk emails that do not comply with the CAN-SPAM Act.
   7. You may have an insecure wireless network which is allowing unknown users to use your network to send spam.
   8. In some rare cases, your recipient's Barracuda Spam Firewall may be misconfigured.

Barracuda Networks is not attempting to block your individual emails in particular. The reputation system uses automated algorithms for determining its results -- very similar to the anti-fraud mechanisms used for credit cards.