Mail software consists of a large number of cooperating pieces, described in RFC 5598. A user composes a message with a Mail User Agent (MUA), which passes it to a Mail Submission Agent (MSA), which in turn usually passes it to a sequence of Mail Transfer Agents (MTAs), which eventually hand it to a Mail Delivery Agent (MDA) to place it in the user's mail store. If the recipient user doesn't read mail on the same computer with the mail store (as is usually the case these days) POP or IMAP transfers the mail to the recipient's MUA. more
U.S. Department of Justice says federal authorities successfully carried out a "significant" coordinated effort to disrupt Business Email Compromise (BEC) schemes designed to intercept and hijack wire transfers from businesses and individuals. more
As Reddit recently learned it's not a great idea to use the Amazon EC2 cloud to host mailservers. There are a number of reasons for this, most of them related to the reputation of mail coming from EC2 servers. When you're using machines in the cloud, changing IP addresses is as simple as initializing a new server. Spammers discovered this almost as soon as the EC2 cloud became public. more
During the M3AAWG meeting in Brussels earlier this year, Dave Crocker and John Levine were asked to step into an impromptu video studio and talk about how email has changed over the past several decades and whether we are any closer to resolving the spam problem. more
RHEL6/Centos6 (and presumably RHEL7/Centos7) machines with the latest openssl packages now refuse SSL connections with DH keys shorter than 768 bits. Consider RHEL6 sendmail operating as a client, sending mail out to a target server. If the target server advertises STARTTLS, sendmail will try to negotiate a secure connection. This negotiation uses openssl, which will now refuse to connect to mail servers that have 512 bit DH keys. The maillog will contain entries with "reject=403 4.7.0 TLS handshake failed". more
DMARC is extremely useful, yet I've heard some vendors are putting their implementations on hold because of the IETF DMARC working group. You really shouldn't wait though -- it's been in wide use for nearly three years, enterprises are looking at DMARC for B2B traffic, and the working group charter is limited in it's scope for changes. Let's compare this to a similar situation in the past. more
I recently read an interesting blog post over at Word to the Wise, about Delivery Emergencies. Laura Atkins makes the point that many email emergencies are a result of poor planning, or an error on the part of the sender... Fortunately, most people grow out of their college fraternity phase, and the same applies to most email senders. As folks become aware of industry standards and best common practices, they adapt their mailing paradigms to what is expected of them by receivers, and recipients. more
Purists have long objected to HTML email on aesthetic grounds. On functional grounds, it tempts too many sites to put essential content in embedded (or worse yet, remote) images, thus making the messages not findable via search. For these reasons, among others, Matt Blaze remarked that "I've long thought HTML email is the work of the devil". But there are inherent security problems, too (and that, of course, is some of what Matt was referring to). Why? more
Two weeks ago I wrote about Yahoo's unfortunate mail security actions. Now it's AOL's turn, and the story, as best as I can piece it together, is not pretty. Yahoo used an emerging system called DMARC, which was intended to fight phishing of often forged domains like paypal.com. A domain owner can publish a DMARC "reject" policy which, oversimplifying a little, tells the world that if mail with their name on the 'From:' line didn't come from their servers, it's not from them so you should reject it. more
Facebook just announced support for PGP, an encrypted email standard, for email from them to you. It's an interesting move on many levels, albeit one that raises some interesting questions. The answers, and Facebook's possible follow-on moves, are even more interesting. The first question, of course, is why Facebook has done this. It will only appeal to a very small minority of users. Using encrypted email is not easy. more
The most effective early email-borne viruses didn't need botnets. They didn't change your computer settings, or steal your login credentials. And they somehow convinced regular users to help them spread. The first warnings about the Good Times virus began to appear in November of 1994, and by December the warnings were seen all over as people did what the warning said, and forwarded it to all their friends. There was another outbreak the following March... more
The highest court in Germany has ruled against telephone and email data retention used to track criminal networks. Melissa Eddy of the Global and Mail reports: "A law ordering data on calls made from mobile or landline telephones and e-mail exchanges be retained for six months for possible use by criminal authorities violated Germans' constitutional right to private correspondence, the Federal Constitutional Court ruled. In its ruling, the court said the law failed to sufficiently balance the need for personal privacy against that for providing security."
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The term "reputation hijacking" continues to spread through the anti-spam community and the press. It's intended to describe when a spammer or other bad actor uses someone else's system -- usually one of the large webmail providers -- to send their spam. The idea is that in doing so, they're hijacking the reputation of the webmail provider's IPs instead of risking the reputation of IPs under their own control. But I really have to laugh (though mostly out of sadness) whenever this technique is described as something new... more
According to the latest report from Anti-Phishing Working Group (APWG) while the total number of conventional, spam-based phishing campaigns declined in 2018, users of software-as-a-service (SaaS) systems and webmail services are increasingly targeted. more
In a presentation EU Commissioner Viviane Reding gave a preview of the new Privacy regulation her DG is preparing. As she states, privacy rules need to be brought up to date and harmonized. With all 27 member states having the same rules and tools to enforce, a company only will deal with one privacy commissioner... So, what if we, for the sake of this blog, take this initiative towards spam and cyber crime. What would this do to spam enforcement? more
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