526268 - [Junk] Only scan new mail

Status: RESOLVED DUPLICATE of bug 517849

(MailNews Core :: Filters, defect)

Description

[Ben Bucksch (:BenB)]

Bug 189970, a request to exclude specific, user-specified folder from Junk filtering, is a very often filed dupe.
Most of the people who ask for that have, however, actually a different problem: They open a folder which has never been spam-filtered by Thunderbird, e.g. because it's coming from another mailer. Suddenly, Thunderbird starts Junk-filtering the *old* mail. Given that it's not perfect, it will remove some of the old ham mails as Junk, essentially delete them. The user may not even notice it. This is data loss.

Here's another solution to the problem, which does not require a user-visible checkbox, and probably would even work better / more correctly:

Proposal:
Let Thunderbird only check "new" mail. Where "new" is defined as:
- Downloaded via POP3
- IMAP "unseen" flag (or however it's called)

(Currently, "new" is defined as "not seen by Thunderbird yet", which leads to the bug described above.)

Comment 1

[Alessandro Vesely]

This is similar to bug 517849 (although the "product" fields differ.)

Comment 2

[Ben Bucksch (:BenB)]

Yes