When a folder with square brackets is used (like Google does it) the folder is shown within the GUI and over EAS too, but no mails are displayed in fact of the following error in the sogo log:

Aug 25 18:31:57 sogod [12593]: |SOGo| starting method 'POST' on uri '/SOGo/so/xxx@xxx.xxx/Mail/0/folder_LS_mEn_RQ__SP_Testfolder/uids'

Aug 25 18:31:57 sogod [12577]: |SOGo| starting method 'POST' on uri '/SOGo/so/xxx@xxx.xxx/Mail/0/folder_LS_mEn_RQ__SP_Testfolder/unseenCount'

Aug 25 18:31:57 sogod [12593]: [ERROR] <0x0xb862f928[NGImap4Connection]> could not select URL: imaps://xxx%40xxx.xxx@127.0.0.1/%5BmEnRQ%20Testfolder/: {RawResponse = "{ResponseResult = {description = \"Mailbox doesn't exist: [mEnRQ Testfolder\"; result = no; tagId = 1779; }; ok = {CLOSED = \"Previous mailbox closed.\"; }; }"; reason = "Mailbox doesn't exist: [mEnRQ Testfolder"; result = 0; }