Spam filter / gateway
Email Security.cloud SMTP Error Codes and Rejection Messages
Email Security.cloud is a Broadcom (formerly Symantec) filtering service that works alongside the Symantec Messaging Gateway, with detailed troubleshooting guides and a submission path for false positives.
- Codes on record
- 4
- Responses
- 5
SMTP 4211 response
A temporary problem. The sending server keeps retrying for a while, and delivery often recovers on its own once the underlying issue clears. See SMTP 421 across every provider
SMTP 4501 response
A temporary problem. The sending server keeps retrying for a while, and delivery often recovers on its own once the underlying issue clears. See SMTP 450 across every provider
SMTP 5501 response
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 550 across every provider
SMTP 5532 responses
smtp;553 Message filtered. Refer to the Troubleshooting page at http://www.symanteccloud.com/troubleshooting for more information. (#5.7.1)
smtp;553 you are trying to use me [xx.messagelabs.com] as a relay, but I have not been configured to let you [x.xx.xx.xx, example.com] do this. Please visit www.symanteccloud.com/troubleshooting for more details about this error message and instructions to resolve this issue. (#5.7.1)
A hard failure. The receiving server has refused the message for good and will not accept an unchanged retry without a change on the sending side. See SMTP 553 across every provider
Email Security.cloud bounce questions
›Why is Email Security.cloud bouncing my email?
Email Security.cloud is a Broadcom (formerly Symantec) filtering service that works alongside the Symantec Messaging Gateway, with detailed troubleshooting guides and a submission path for false positives. Match the exact wording of your bounce to one of the 5 responses on this page to find the specific reason and fix.
›How do I get past the Email Security.cloud spam filter?
Authenticate with SPF, DKIM and DMARC, keep your sending IP and domain reputation clean, mail only engaged recipients, and honour unsubscribes. Email Security.cloud also publishes postmaster guidance, linked on this page.
