As mentioned last week, we are now deferring all mail from popular SPAM blacklists at SpamCop and SpamHaus. It is important to stress that we are not blocking or rejecting mail from these sites, merely temporarily deferring accepting messages. This subtle difference is what separates spammers from legitimate senders. Legitimate mail server operators will immediately notice they are on an RBL and will address the issue and remove themselves from it.

Our choice of SpamCop and SpamHaus came after years of use, peer reviews and our own statistical models indicating that they rarely make mistakes. We are not using third party reputation lists or greylisting which will delay mail delivery, we are just making sure that the mail arriving to you is from a legitimate source and a secure mail server.

Important Notice: tempfail effect on SureSPAM

Nearly all the messages in SureSPAM quarantine was from SpamHaus and SpamCop. As a result of us tempfailing mail from these known SPAM sources, you will see a significant decrease in SPAM and junk mail report stats as well. If you have clients that you have not yet migrated from SPAM reports to our Outlook and Desktop software, we recommend sending them the following alert:

“Today <Product Name> started temporarily deferring mail from known SPAM sources. This change will make your mail flow more efficient and reduce potentially fraudulent mail (phishing) that slips through when you whitelist large company domains.

As a result of this change you will see a significant reduction in SPAM report contents and will have less SPAM to review through the <Product Name> Outlook addin and/or Desktop agent.

P.S. Please note that we are not bouncing or rejecting mail, we are simply deferring it to allow legitimate mail server operators to address the reason why they ended up on the RBL in the first place. The two blacklists in use are SpamCop (www.spamcop.net) and SpamHaus (www.spamhaus.org) and both provide very reputable databases of known spammers. If you are having an issue receiving mail from certain recipients, have them make sure they are not on known blacklists at the above sites.”

We are closely monitoring the network during this change and will update the NOC blog if there are any issues. We do not expect anything unusual to come as a result of this implementation.

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