+# our exim class
+# @param use_smarthost use the smarthost
+# @param smarthost host to relay through (if set and use_smarthost)
+# @param is_bugsmx this system handles bugs.debian.org
+# @param is_mailrelay this system is a mailrelay, both in and out, for debian hosts
+# @param is_rtmaster this system handles rt.debian.org
+# @param is_packagesmaster this system handles packages.debian.org
+# @param is_packagesqamaster this system handles packages.qa.debian.org
+# @param mail_port override the default incoming mailport (only applicable for hosts behind an incoming relay)
+# @param smarthost_port the port on which satellites send mail to the smarthost (needs to be the same on both sides)