Unable to sync local 'seen' flag to server

[xinmeng]

General informations

• system/distribution (with version): Linux debian9 4.9.0-3-amd64 Missing master commit #1 SMP Debian 4.9.30-2+deb9u5 (2017-09-19) x86_64 GNU/Linux
• offlineimap version (offlineimap -V): offlineimap v7.0.12, imaplib2 v2.55 (system), Python v2.7.13
• Python version: v2.7.13
• server name or domain:
• CLI options:

Configuration file offlineimaprc

[general]                                                                                                                                                                                                                                 
accounts = WX                                                                                                                                                                                                                             
                                                                                                                                                                                                                                          
[Account WX]                                                                                                                                                                                                                              
localrepository = Local                                                                                                                                                                                                                   
remoterepository = Remote                                                                                                                                                                                                                 
quick = 10                                                                                                                                                                                                                                
                                                                                                                                                                                                                                          
[Repository Local]                                                                                                                                                                                                                        
type = Maildir                                                                                                                                                                                                                            
localfolders = ~/maildir                                                                                                                                                                                                                  
                                                                                                                                                                                                                                          
[Repository Remote]                                                                                                                                                                                                                       
type = IMAP                                                                                                                                                                                                                               
remotehost = imap.exmail.qq.com                                                                                                                                                                                                           
auth_mechanisms = LOGIN                                                                                                                                                                                                                   
ssl = yes                            

When I have new message fetched in, I use Emacs mu4e to read it. The message becomes flagged as "seen". But message on server is still unread.

Is there any configuration to fix this?

Thanks!

Xin Meng

[nicolas33]

What's the command line used to run offlineimap?
What happens if you run offlineimap manually with offlineimap -a WX?