Symantec IPs are blacklisted on SORBS

Products

• Email Security.cloud

Issue/Introduction

One of the IP addresses for Email Security.cloud has been blacklisted by SORBS, a reputable public block list utilized by the intended recipient of the email.

An error can be seen in Track and Trace log:

Error: 554 5.7.1 Service unavailable; Client host [XX.XX.XX.XX]

blocked using dnsbl.sorbs.net; Currently Sending Spam See:

http://www.sorbs.net/lookup.shtml?XX.XX.XX.XX

Note: XX.XX.XX.XX is one of the IP addresses of Email Security.cloud delivery servers.

Cause

The error indicates that Email Security.cloud attempted to deliver the message to the intended recipient’s server, but the message was rejected due to the email block list of SORBS. IP addresses for Email Security.cloud may occasionally get blacklisted due to users who abuse the service by sending spam, or from compromised servers relaying spam through the Email Security.cloud infrastructure.

Resolution

Contact the sender to resend the mail when you noticed the error mentioned above.

Broadcom proactively monitors email block lists and raises a removal request to SORBS in real time, so delivery problems associated with this error is usually temporary.