New M3AAWG Documents About Blocklists and Compromised User IDs

Return Path is a Sponsor-level member of M3AAWG, the Messaging, Malware, and Mobile Anti-Abuse Working Group. As M3AAWG members, we are committed to collaborating with others in the industry to produce best practices documents to help organizations prevent network abuse. Recently, M3AAWG published two documents that we wanted to highlight. The first document, “Help – I’m On A Blocklist”, is... Continue »

Spamhaus Announces New DBL Return Codes

Spamhaus announced that it is rolling out two new sets of return codes for its Domain Block List (DBL) beginning July 1, 2014. The first set is used to list malware domains and botnet command and control (C&C) domains. The second set is used to list legitimate domains that are compromised. The announcement from Spamhaus states “This new data makes DBL more effective and versatile yet maintains... Continue »

AOL Next Mailbox Provider to Apply DMARC Reject Policy

On April 4, Yahoo published a DMARC reject policy, telling mailbox providers to reject any mail from a Yahoo domain if it doesn’t come from Yahoo’s own servers. Today, AOL confirmed that many of its users have also been compromised, and the spammers are spoofing their addresses to send mail to their contacts. Yahoo made it hard for them to spoof Yahoo users, so they moved on to AOL. Today, AOL... Continue »

All About Yahoo's DMARC Reject Policy

Two weeks ago today, Yahoo became the first major mailbox provider to publish a DMARC policy of reject. For those of you who are not familiar with DMARC and don’t know what a reject policy is, this means that Yahoo has a line of text in their DNS record telling mailbox providers (MBPs) to reject any mail from a Yahoo domain if it doesn’t come from Yahoo’s own servers. This was big news and had a... Continue »

Advice from Mailbox Providers for Holiday Mailing

"Best practices are the same all year round, but the stakes go up at holiday time -- the senders care more, the receivers have higher volumes, and the customers are more annoyed." – anonymous mailbox provider   Every fall, mailbox providers see huge increases in promotional mail as email marketers try to reach consumers who may be shopping for the holidays. The chart below from one of our... Continue »