read state not propagated

[Aki Tuomi]

> On 29/12/2020 13:22 Marc Roos <m.roos at f1-outsourcing.eu> wrote:
> 
>  
> I have migrated the inbox namespace from mbox to mdbox by doing a 
> doveadm backup to the new server. Both servers are having CentOS7 + 
> dovecot-2.2.36-6.el7_8.1.x86_64, both servers have identical 
> configurations (new server has some different vsz_limits and stats 
> enabled)
> 
> Now a user complains that an imap mailbox he opens at the same time with 
> a colleague does not propagate the 'read' state. Previously if his 
> colleague read the message, it would show on his mailbox also 'read'. 
> After the transfer it keeps being unread for him.
> 
> Am I correct to assume that he should indeed get an updated to 'read'? 
> Where should I look to fix this? What can be the cause of this?

How are they accessing the mailbox? Same credentials?

Aki