# email.errors.BoundaryError

- **ID:** `python/email-errors-boundaryerror`
- **Domain:** python
- **Category:** protocol_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

MIME boundary could not be found or was malformed in multipart message.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |