On Jobspotting, you can browse a limited choice of (2 job offers) in Germany. Linux or Engineering job offers are overarching themes worth a look, as these are the main categories the job opportunities can be broken down to. Jobs in this area need job seekers familiar with Postfix, Squid, and RPM Package Manager.
Unfortunately for those looking for an internship in the area of qmail, companies in this area are mainly hiring seasoned job seekers. Use the Explore search bar to learn about jobs in other areas or places.