SMTP code 552 5.3.4
What the knowledge base's own tables say about this code, and which articles say it — a description of the reply, never a placement prediction.
The knowledge base documents this code in more than one row. What tells those rows apart is the rejection text in your own log, not the code: read each line below against what your rejection says.
This line comes from a knowledge base article on Gmail, not on the standard.
- Message
- Message exceeded size limits
- Meaning and fix
- The whole message is too large
- Message
- "The number of attachments exceeds Google's limit"
- Meaning and fix
- Send fewer attachments
- Message
- Header size limits exceeded: total headers, a header value, a header name, or the Subject: header
- Meaning and fix
- Shrink the headers