Sieve & Public folders issue (2nd episode)

Hello Community,

Getting back to my previous post, here a a complement:

• Having enabled sieve, I can store mails and create folder under the recipient
• Having enabled public folders, I can move mail into them using a client (eg Thunderbird); security is therefore ok (actually I gave full control to the user) eg Public/Newsletters/SomeCompany
• *BUT* running a sieve script to store to Public/Newsletters/SomeCompany returns the following in the logs: "failed to store into mailbox 'Public/Newsletters/SomeCompany': Permission denied."

Any tip?

Thank you for your help.

Greetz