Learn how to interpret common email bounce back error codes and messages for Symantec Email Security.cloud clients.

Email bounce backs occur when an email is sent to an Email Security.cloud client, and a rule is triggered by the email recipient's configuration.

Bounce back errors

• 450 Requested action aborted (4)
• 450 Requested action aborted (9)
• 460 too many messages
• 501 Connection rejected by policy (7.2)
• 501 Connection rejected by policy (7.7)
• 550 Requested action aborted (4)
• 550 Invalid recipient
• 553 - sorry, your envelope sender is in my badmailfrom list
• 553-SPF (Sender Policy Framework) domain authentication fail
• 553-Message filtered
• 553 – you are trying to use me as a relay
• Sorry, your email/domain/IP address has been blacklisted
• I have not yet been able to deliver your message
• Recipient mailbox is not allowed
• You are trying to use me [server-x.tower-xx.messagelabs.com] as a relay

Additional troubleshooting

• Symantec.cloud customers: Log in for additional troubleshooting options.
• Non-Symantec.cloud customers: For more information on why your email was blocked by Symantec services, see Emails sent to a Symantec.cloud customer are not being delivered.