- some mails from the mail gateway should use an empty envelope sender (RT#593)
- add aliasnames (db, buildd, ..) to ssh_known_hosts
- get rid of openssh patch requirement
+- use --delete in ud-replicate's rsync?
+- fix ud-useradd emails with non-ascii in subject
+- allow to keep further auth tokens in the LDAP, for example for SMTP AUTH or
+ SIP stuff. Or OpenID. Or whatever.