Sieve difference(s) current mailbox server

After migrating to a new mailbox server on Sunday, March 31, we noticed different behaviour in the processing of mailbox filters (by the Sieve software).

Firstly, the ‘include’ of global spam+virus filtering rules had a side-effect which has been fixed using a newer version of the software.

Secondly, the default behaviour of the ‘fileinto’ statement underwent a change: previously, it featured an implicit ‘stop’ statement, but now it requires an explicit ‘stop’ statement after the ‘fileinto’ to achieve the same effect.

These modifications have inadvertently caused additional copies of emails to be placed in users’ INBOX folder(s), using their own Sieve filter rules.