Recent Posts
Stop SHOUTING
- steve
- Sep 8, 2010
The nice folks at Box of Meat pointed me at an article about SHOUTING in ALL CAPITALS.
Read MoreContent based filtering
- steve
- Sep 7, 2010
A spam filter looks at many things when it’s deciding whether or not to deliver a message to the recipients inbox, usually divided into two broad categories – the behaviour of the sender and the content of the message.
When we talk about sender behaviour we’ll often dive headfirst into the technical details of how that’s monitored and tracked – history of mail from the same IP address, SPF records, good reverse DNS, send rates and ramping, polite SMTP level behaviour, DKIM and domain-based reputation and so on. If all of those are OK and the mail still doesn’t get delivered then you might throw up your hands, fall back on “it’s content-based filtering” and not leave it at that.
There’s just as much detail and scope for diagnosis in content-based filtering, though, it’s just a bit more complex, so some delivery folks tend to gloss over it. If you’re sending mail that people want to receive, you’re sure you’re sending the mail technically correctly and you have a decent reputation as a sender then it’s time to look at the content.
You want your mail to look just like wanted mail from reputable, competent senders and to look different to unwanted mail, viruses, phishing emails, botnet spoor and so on. And not just to mechanical spam filters – if a postmaster looks at your email, you want it to look clean, honest and competently put together to them too.
Some of the distinctive content differences between wanted and unwanted email are due to the content as written by the sender, some of them are due to senders of unwanted email trying to hide their identity or their content, but many of them are due to the different quality software used to send each sort of mail. Mail clients used by individuals, and content composition software used by high quality ESPs tends to be well written and complies with both the email and MIME RFCs, and the unwritten best common practices for email composition. The software used by spammers, botnets, viruses and low quality ESPs tends not to do so well.
Here’s a (partial) list of some of the things to consider:
In Atlanta through Friday
- laura
- Sep 6, 2010
Off to visit the Chimps this week in Atlanta. Blogging from me may be light, but Steve will be around.
Read MoreWe're gonna party like it's 1996!
- laura
- Sep 6, 2010
Over on deliverability.com Dela Quist has a long blog post up talking about how changes to Hotmail and Gmail’s priority inbox are a class action suit waiting to happen.
All I can say is that it’s all been tried before. Cyberpromotions v. AOL started the ball rolling when they tried to use the First Amendment to force AOL to accept their unsolicited email. The courts said No.
Time goes on and things change. No one argues Sanford wasn’t spamming, he even admitted as much in his court documents. He was attempting to force AOL to accept his unsolicited commercial email for their users. Dela’s arguments center around solicited mail, though.
Do I really think that minor difference in terminology going to change things?
No.
First off “solicited” has a very squishy meaning when looking at any company, particularly large national brands. “We bought a list” and “This person made a purchase from us” are more common than any email marketer wants to admit to. Buying, selling and assuming permission are par for the course in the “legitimate” email marketing world. Just because the marketer tells me that I solicited their email does not actually mean I solicited their email.
Secondly, email marketers don’t get to dictate what recipients do and do not want. Do ISPs occasionally make boneheaded filtering decisions? I’d be a fool to say no. But more often than not when an ISP blocks your mail or filters it into the bulk folder they are doing it because the recipients don’t want that mail and don’t care that it’s in the bulk folder. Sorry, much of the incredibly important marketing mail isn’t actually that important to the recipient.
Dela mentions things like bank statements and bills. Does he really think that recipients are too stupid to add the from address to their address books? Or create specific filters so they can get the mail they want? People do this regularly and if they really want mail they have the tools, provided by the ISP, to make the mail they want get to where they want it.
Finally, there is this little law that protects ISPs. 47 USC 230 states:
Gmail Evolution
- steve
- Sep 3, 2010
All the cool kids are doing infographics, so here’s our take on the new Gmail Priority Inbox.
Spammers quickly adopting social media
- laura
- Sep 2, 2010
Spammers have already discovered they can send spam through Apple’s new Ping service. Yes, some of the fastest adopters of new technology are spammers.
Isn’t technology wonderful?
The cult of SPF lives
- laura
- Aug 31, 2010
Years ago, prior to the public discussions of Domain Keys, there was SPF as the solution to all our email authentication problems. SPF was going to let people do all sorts of things with email. The proponents even privately asserted that it would solve the spam problem. In essence, SPF was a cult. BoF sessions at meetings had the flavor of a big tent style revival. Those of us who didn’t support SPF were shunned and belittled. How could we not support such a brilliant protocol? Did we want spam to continue being a problem? All our objections no matter how rooted in reality were dismissed out of hand. SPF was an evangelical, cult-like movement.
I am somewhat sad to announce that the cult of SPF still lives. The most recent example is the number of people that have taken me to task for a recent post I wrote pointing out that SPF records aren’t actually that important for email delivery. My example was that a client of mine had incorrect SPF records (with a -all even) but was still getting inbox delivery at Hotmail. We repaired the records, re-registered them with Hotmail and Hotmail not only isn’t checking them but also sent mail to me admitting they don’t check SPF for incoming email.
My statement was that SPF wasn’t really important to getting email delivered. This seems to have upset a number of people. Someone on twitter pointed out that a valid SPF record gave you a positive score with SpamAssassin. What they didn’t mention was that a valid SPF record gives you an entire -0.001 with SpamAssassin.
Today I get a comment from Tom (which seems more like an ad for his company than an actual comment) that says
Email marketing is hard
- laura
- Aug 30, 2010
I’ve watched a couple discussions around the email and anti-spam community recently with a bit of awe. It seems many email marketers are admitting they are powerless to actually implement all the good advice they give to others.
They are admitting they can’t persuade, cajole, influence or pressure their companies to actually follow best practices. Some of the comments public and private comments I’ve heard from various industry leaders:
Gmail and SenderScore
- laura
- Aug 27, 2010
Return Path discusses that a high (>80) SenderScore is correlated with inbox delivery at Gmail.
Read MoreBotnets and viruses and phishing, oh my!
- laura
- Aug 25, 2010
MessageLabs released their monthly report on email threats yesterday. Many media outlets picked up and reported that 41% of spam was from a the Rustock botnet.
Other highlights from the report include:
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