Begin 2012-11-16 04:45:00
End 2012-11-17 12:00:00
Affected Users of horde webmail and users wanting to send mail to e.g.

Horde webmail again appeared to be misused for sending spam. This could happen because a naive user gave the Science password to phishers/spammers. After first stopping horde, early Friday morning we disabled the account of the naive user and restarted horde. Saturday morning it appeared that this short spam-outbreak had caused administrators of to add our mail server to their blacklist. Therefore we switched the IP-number of this mail server Saturday morning.