spamfilter policy sync mailbox to alias
Default behaviour: When creating a alias, the spamfilter policy of the maildomain is set.
Request behaviour: use the mailbox settings of the destination mailbox as default setting of the alias. if not set then use the maildomain settings.
Why: if a mailbox has set his mailbox on uncensored, but the maildomain is set to filter email. Alias adresses are getting filtered.