Spam filter improvements

June 21, 2012 2 Comments

We’re currently tweaking the Runbox spam filter configuration to catch more spam.

Specifically, we’ve fixed an error that caused messages with a valid DKIM (DomainKeys Identified Mail) header to pass straight through the spam filter. Since some spam unfortunately includes such a header we now scan messages regardless of their DKIM status.

We have also tweaked the spam score given to messages sent from dynamic IP addresses, which can also be an indication of spam (although most such messages are of course innocent).

We would be interested in your feedback regarding the spam situation in your own account and whether you see any improvements.

Thank you!

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Fixed: Spam problems

February 15, 2012 Leave a comment

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.

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Major spam filter upgrade

June 24, 2010 Leave a comment

We have performed a major upgrade of the main Runbox spam filter (SpamAssassin) to the most recent version (3.3.1) and it’s running a fresh spam rule set that’s more aggressive towards spam.

We recommend that you check your spam folders for any misclassified messages during the next few days, and correct your trainable spam filter (if activated on the Filter page) using the “Not spam” link if necessary.

Furthermore, we have implemented a global filter that rejects messages that are virtually guaranteed to be spam (i.e. if the SpamAssassin score is 7 or more). This will significantly decrease the amount of spam that passes through to the user-level spam filters, and decrease the load on practically all levels of the system.

No email will be lost as a consequence of this change — in the very unlikely eventuality that a legitimate message is rejected, the sending server will be notified that the message was believed to be spam so that the sender can try again.

For more information about how Runbox fights spam, see our Anti-spam section.

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