Message-Id: 201512120900
Time: 16.12.2015, 9:00 am
Affected: Users of UNIX-Mail servers “mailer.gwdg.de” or “mailer.mpg.de” (not Exchange!)
Impact: Gradual limitation of Sending E-mails

As previously announced, sending e-mail using our UNIX mailserver “mailer.gwdg.de” or “mailer.mpg.de” without authentification has been disabled today.

Background: Due to an increase of attacks on and of the UNIX mail system and it’s very important role within the e-mail transport, “mailer.gwdg.de” and “mailer.mpg.de” can only be used by previously registered systems and authentificated users.

Administrators, who still need to use anonmymous delivery on port 25, are requested to send an email to support@gwdg.de.