Outbound email traffic is automatically monitored for rate control by the Barracuda Email Security Service. If the volume of outbound mail messages from the service exceeds normal levels during a 30 minute time frame, the rate control feature takes effect and outbound mail is deferred until the end of the 30 minute time frame. IP addresses of senders of outbound mail who consistently trigger rate control are logged on the Outbound Settings > Abuse Monitor page in the IP Addresses With Recent Abuse table.
An abuse notification email may be sent to the administrator of your Barracuda Email Security Service for various reasons. These include but are not limited to:
- Sending mail to more recipients per 30 minute period then allowed by the Barracuda Email Security Service.
- Sending out mail to more invalid recipients than allowed by the Barracuda Email Security Service.
- Sending out mail that has been classified by the Barracuda Email Security Service as spam or as containing a virus.
If your network sends out a large email blast, this may trigger an abuse notice from the Barracuda Email Security Service. This notice informs you that you are sending out mail to more recipients per 30 minute period than the Barracuda Email Security Service allows. This is not a block of your mail, but rather delays the delivery of the messages. The mail will eventually go out, but at a much slower rate over a longer period of time.
To prevent generation of an abuse notice, it is recommended that you spread out the delivery of email blasts over a longer period of time or to smaller groups of recipients, and to make sure that the addresses you are sending to are legitimate. The limits set by the Barracuda Email Security Service on the number of recipients that can be sent mail per 30 minutes protects against an outbound spam attack from a customer's network.
IP Addresses With Recent Abuse
The owner of an IP address that appears in this table on the Outbound Settings > Abuse Monitor page for consistently exceeding rate controls may use the Request Increased Limit button to request Barracuda Networks to allow a higher volume of outbound mail so that rate control does not take effect.
Suspended IP Addresses
IP addresses that send very high volumes of email, consistently triggering rate controls, may be suspended from sending outbound mail through the Barracuda Email Security Service. Contact Barracuda Networks Technical Support if your IP address appears in this list.