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@@ -100,6 +100,14 @@ fetchmail-6.4.0 (not yet released):
(OpenSSL 1.0.2 reported incompatible with pop3.live.com by Jerry Seibert).
* A foreground fetchmail can now accept a few more options while another copy is
running in the background.
+* fetchmail now handles POP3 --keep UID lists more efficiently, by using Rainer
+ Weikusat's P-Tree implementation. This reduces the complexity for handling
+ a large UIDL from O(n^2) to O(n log n) and becomes noticably faster with
+ thousands of kept messages. (IMAP does not track UIDs and is unaffected.)
+ At the same time, the UIDL emulation code for deficient servers has been
+ removed. It never worked really well. Servers that do not implement the
+ optional UIDL command only work with --fetchall option set, which in itself is
+ incompatible with the --keep option (it would cause message duplication).
## FIXES
* Fix a typo in the FAQ. Submitted by David Lawyer, Debian Bug#706776.