Google Message Security Troubleshooting Guide User Manual
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Mail Flow Troubleshooting 65
Message security service error messages
If the message did come from the email security service, consult the following
table.
After Troubleshooting
After you’ve followed these steps, ask the sender to send another message to
confirm that the problem has been resolved.
Contact Support
If the problem continues after these troubleshooting steps, please contact
Error Message
Possible Causes
Action to Take
550 mailbox unavailable
552 storage allocation exceeded
553 mailbox name not allowed
554 transaction failed
571 spam source blocked
Connection Manager
Preventing Attack Blocking.
550 no such user
Non-Account
Bouncing
Administration Console. See Add / Delete /
Move Users.
571 message refused
Blatant Spam
Blocking
582 This message violates our
email policy
Content Manager
Check your Content Manager filters. See
582 The file attached violates
our email policy
Attachment Manager
Check Attachment Manager settings. See
582 (Custom error message)
Attachment Manager
or Connection
Manager
This is a custom message, set by an
administrator using either Attachment
Manager or Connection manager. Check both
to see what rules are being triggered. See
Create or Edit a Content Manager Filter.
571 Virus Blocked
Virus Blocking
The sender’s mail server is infected. Ask the
sender to run antivirus diagnostics.
451 STARTTLS is required for this
sender
TLS
the sender. See Set Up Inbound TLS.
If you do not want to change your TLS
settings, ask the sender to install TLS on their
mail server.