lyrathorpe/legacy-email-proxy
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

SMTP relay corrupts 8-bit message content #4

New Issue
Closed
opened 2026-06-17 17:12:09 +01:00 by lyrathorpe · 0 comments
lyrathorpe commented 2026-06-17 17:12:09 +01:00
Owner
Copy Link
Copy Source

SMTPProxyHandler.send_message (proxy_server.py:349) does:

message = data.decode("utf-8", errors="replace")

errors="replace" destroys any non-UTF-8 byte, damaging 8-bit bodies and attachments. smtplib.sendmail accepts bytes directly.

Fix:

  • Pass the raw envelope.content bytes to smtp.sendmail without decoding.

Acceptance:

  • A message with non-UTF-8 / 8-bit content is relayed byte-for-byte.
SMTPProxyHandler.send_message (proxy_server.py:349) does: message = data.decode("utf-8", errors="replace") errors="replace" destroys any non-UTF-8 byte, damaging 8-bit bodies and attachments. smtplib.sendmail accepts bytes directly. Fix: - Pass the raw envelope.content bytes to smtp.sendmail without decoding. Acceptance: - A message with non-UTF-8 / 8-bit content is relayed byte-for-byte.
lyrathorpe added the bug label 2026-06-17 17:12:09 +01:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
bug
Defect / incorrect behaviour
 ci
CI / build pipeline
 docs
Documentation
 enhancement
Improvement to existing behaviour
 security
Security hardening
No Label bug
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
lyrathorpe
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: lyrathorpe/legacy-email-proxy#4
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?