[Dovecot] POP3: Message ordering changed unexpectedly

[Timo Sirainen]

On 7.2.2014, at 15.16, Gedalya <gedalya at gedalya.net> wrote:

>> So also add something like "uidls=%u" to your pop3_logout_format. This will use up a little bit more memory by storing all the UIDLs in memory. The %u output can sometimes be used to debug why POP3 clients are redownloading messages.
>> 
> Your commit message says: "..can be completely avoided by using either pop3_lock_session=yes or adding %u to pop3_logout_format."
> If I understand you correctly, this is a setting for formatting the entry in the log file, and by using %u I'm forced to save the UIDLs in memory
> and as a side effect I circumvent the problem of colliding with another simultaneous pop3 client? So using %u would not help troubleshoot the problem but actually fix it?

Yeah, as a side effect of %u it'll also fix your problem entirely. I first thought about adding a new setting but then I realized this can be used without adding any settings.