I answered this some hours ago. If you don't read all mails to mailing list, don't set the Reply-To: header to mailing list.
On 8.6.2011, at 0.54, Ricardo Branco wrote:
anyone seen this issue, its still plaguing us and also seems to have a knock on affect as our blackberries are seeing messages late
On 24/05/2011 10:44, Ricardo Branco wrote:
Dovecot 2.0.13 Centos 5.4 x86_64 2.6.18-164.9.1.el5 (on ESXi) OS/Logs on local storage, /home all on NFS server for datastore (NFS Store Centos 5.5 x86_64 2.6.18-194.11.1.el5) Thunderbird 3.1.10 on XP/W7 Desktops
We are seeing a werid issue where there is a delay of up to a few mins in seeing label updates on messages. I have confirmed that Thunderbird is sending the update to the server with WireShark, its just additional users connected to the same mailbox do not see them. Marking a message as Seen/Un-Seen happens faster just not labels. If you have a label set when you mark a message as Seen/Un-Seen the other clients then see the update straight away.