16 Oct
2018
16 Oct
'18
5:10 p.m.
On 16.10.2018 15:43, Yassine Chaouche wrote:
I don't fully understand how could this prevent them from forwarding to any other domain by other means, for example by using a managesieve- able client
Well, your OP made no mention of your environment. ;-) You posted on the Dovecot mailing list, so I suppose we know what your IMAP server is, but you mentioned nothing beyond that.
I made the assumption that your users are allowed to use sieve, based on the subject line, but you did not elaborate on how they use it. Simplest form: Sieve files. If you generate the files, you can screen the content and also keep them read-only for users.
If you have important restrictions/conditions, you need to mention them to us.
-Ralph