POP3 DELE marks are wiped by STAT/LIST/UIDL #2

New Issue

2026-06-17T17:12:04+01:00

lyrathorpe commented

2026-06-17 17:12:04 +01:00

POP3Session._refresh_mailbox (proxy_server.py:225) calls self.deleted.clear(), and handle_stat, handle_list and handle_uidl all invoke _refresh_mailbox() on every call.

A normal client sequence (DELE 1; STAT; QUIT) loses the pending deletion: STAT clears the deleted set, so handle_quit expunges nothing.

RFC 1939 also requires the maildrop to be locked and static for the duration of the session; re-listing mid-session shifts message numbers under the client.

Fix:

Snapshot the UID list once at authentication.
Do not clear the deleted set on STAT/LIST/UIDL.
Remove _refresh_mailbox and its mid-session calls.

Acceptance:

DELE followed by STAT/LIST/UIDL then QUIT still expunges the marked messages.
Message numbering is stable for the lifetime of the session.

POP3Session._refresh_mailbox (proxy_server.py:225) calls self.deleted.clear(), and handle_stat, handle_list and handle_uidl all invoke _refresh_mailbox() on every call. A normal client sequence (DELE 1; STAT; QUIT) loses the pending deletion: STAT clears the deleted set, so handle_quit expunges nothing. RFC 1939 also requires the maildrop to be locked and static for the duration of the session; re-listing mid-session shifts message numbers under the client. Fix: - Snapshot the UID list once at authentication. - Do not clear the deleted set on STAT/LIST/UIDL. - Remove _refresh_mailbox and its mid-session calls. Acceptance: - DELE followed by STAT/LIST/UIDL then QUIT still expunges the marked messages. - Message numbering is stable for the lifetime of the session.

lyrathorpe added the bug label 2026-06-17 17:12:04 +01:00

lyrathorpe referenced this issue from a commit

2026-06-17 17:22:30 +01:00

fix: correct POP3 RETR/TOP, static maildrop, and IMAP fetching

lyrathorpe referenced a pull request that will close this issue

2026-06-17 17:22:53 +01:00

Fix POP3/SMTP correctness and IMAP robustness #10

lyrathorpe closed this issue

2026-06-17 17:33:10 +01:00

lyrathorpe referenced this issue from a commit

2026-06-17 17:33:11 +01:00

Fix POP3/SMTP correctness and IMAP robustness (#10)