Support mail filtering by envelope :detail (+ part in mail addresses)
To enable users to manage mailfilters by envelope :detail without access to custom filters, I added a 4th filter type to the mailfilter selection and added required changes to filter generation, sieve script templates and postfix config.
Example for a filter:
Address Detail is 'blog' -> move to Blogs
--> all mails sent to firstname.lastname@example.org get moved into Blogs