To prepare the next big step in our migration to the new mail server we will have a minor maintenance downtime of our SMTP server on Monday, the 1st of February 2010, starting on 5pm. During the downtime it won't be possible to send or receive new mails via SMTP nor will it be possible to use the mailing lists administrative interface. Mails sent to the Department of Physics during the downtime will be held back on the sending side and will be received afterwards. Mails already stored on our IMAP or POP3 server are accessible during the downtime though. Update, 17:25: Everything back to normal again.