I have seen something similar, and fixed it by telling the user in
question to empty his Trash folder, compact folders, and restart Outlook.
I've also seen something similar where Outlook's spam filter was
attempting to delete messages from a read-only shared folder that they
weren't subscribed to (thanks Outlook). As a result, Outlook repeatedly
copied the messages from the shared folder to the spam folder. I added
the sending domain (it was internal messages only) to a whitelist in
Outlook somewhere and it stopped.
That doesn't help much if you don't have control over your users'
Outlook settings though.
Mark
On 2026-01-16 17:25, quoth Wolfgang Breyha via Info:
Hi!
Since I have my doubts that M$ will fix this any time soon I want to ask it
here.
I see a lot of Outlook 2024 clients (eg. imap id "version"
"16.0.19426.20218","16.0.19530.20074",...) in my logs which enter an
infinite "append/expunge" loop for the same message. Only stopped by ending
Outlook or the frontend process of cyrus.
If it is a rather large message our spools are getting out of disk space
quite fast (over night) if the connection is fast.
Until today we recognized it because of "out of disc space" about once a
month. But today I wrote a short script to scan our logs for this issue and
I see about 20-50 misbehaving sessions a day with loop counts up to 45k
append/expunge for the same message. Only undetected yet because of small
message sizes.
This occurs on our cyrus 3.8.6 classic murder setup.
Can somebody confirm this?
I'm currently not sure how to handle/prevent this besides killing those
sessions.
Greetings,
Wolfgang
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