We will set up a Mail Server using Postfix and Dovecot and an OpenLDAP backend with a custom LDAP schema. Our schema uses a dedicated organization unit called mail which acts as a container for all of our hosted domains and users. The virtual mail users will use their primary e-mail address to login to […]

Many mail systems add custom headers to outgoing mails to indicate scans, general processing or spam decisions. While this bloats up messages in general, it may also conflict with headers the local MTA wants to use. We will therefore clean up some usual suspects before our MTA will filter the incomming mails. External headers A […]

We will set up a Postfix restriction class which will limit our policy service to a subset of users. Not only will this avoid unnecessary queries on aliased mailboxes, it will also allow us to override the result using DUNNO in case the IMAP backend is unable to serve the query. # We will only […]