You might have noticed an increased influx of spam recently, and it’s caused by problems with the RBL (Real-time Blackhole List) we have been using at Runbox. An RBL is a list of domain names associated with spamming, and is used when filtering spam.
We’re working on a solution which will be better than what we had before, and hope to have it running within a couple of days.
Update: This was fixed on friday 17th of february when we implemented SpamHaus RBL.