SPF records: not really all that important

I’ve been working through some Hotmail issues with a client over the last few months. One of the things that has become clear to me is how little Hotmail actually does with SPF records. In fact, Hotmail completely ignored my client’s SPF record and continued to deliver email into the inbox.
This isn’t just a sender that had a “well, we think most of our email will come from these IPs but aren’t telling you to throw away email that doesn’t” record. In fact, this client specifically said “if email doesn’t come from this /28 range of email addresses, then it is unauthorized and should be thrown away.” The email was being sent from an IP outside of the range listed in the SPF record.
As part of the process involved in fixing the delivery problems, I had the client update their SPF record and then I enrolled their domain in the SenderID program at Hotmail. This didn’t have any effect, though. Hotmail is still not checking SPF for this client. When I asked Hotmail what was going on they said, “We do not do lookups on every sender’s mail.”
So, there you have it folks. The last bastion of SPF/SenderID has abandoned the technology. Even a totally invalid SPF record doesn’t matter, mail can still reach the inbox at Hotmail.

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Spamfilters: a marketer's best friend

I was cleaning out my spam folder this afternoon. I try and do it at least once a day, otherwise the volume gets so bad I don’t actually look at the mail I just mark it all as read. I realized, though, that spamfilters are actually a marketer’s best friend.
If there were no spam filters keeping all the crap people get out of their inbox (in my case over 1000 messages a day) then spam would overwhelm even the most dedicated email junkie. I couldn’t do my job without my spam filters, and in fact the recent rash of virus spew is ending up in my inbox and making finding real mail a problem. I do a lot of sorting before mail ever hits my inbox, and I’m still struggling to deal with the couple hundred “your order has shipped!” and “please her tonight!” emails that my local bayesian filters haven’t caught up to, yet.
Today’s stats:
Work inbox: 17 messages
Work spam: 419
95.9% spam
Personal inbox: 40
Personal spam: 975
95.9% spam
Without filters, I couldn’t accurately find that 4.1% of real mail that I get. Without filters, I couldn’t do my job. Without filters, I couldn’t find the real receipts from purchases I actually made. Without filters, I couldn’t read and respond to mail I wanted.
A mailbox overflowing with spam is unuseable, and email marketers should be thankful that providers work so hard to keep spam out. Otherwise, email wouldn’t be useful for anything.

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Ownership of the inbox

Marketers often treat recipient inboxes with a certain level of ownership. They talk about getting mail to the inbox with the underlying implication that inboxes are for use by marketers and they tend to forget that recipients use email for a lot of things, not just being marketing targets.
This was crystallized for me a few years ago when I was running a conference session. The session had a very diverse group of attendees and as part of the session they broke up into smaller groups to talk about various email related topics. One of the questions was how do people use email. Those groups with more ISP representatives produced a list with dozens of ways people use email. The groups dominated with email marketers, though, came up with a much more limited set of uses, all of them related to marketing or commerce. They didn’t mention mailing lists or one on one discussions or connecting with friends as part of the things people use email for.
Marketers seem to forget that email was not adopted by users so they could be marketed to. In fact, email is primarily used by people to interact with friends, colleagues, allies and family members. Most recipients really don’t really care about marketing in their inbox. They’re much more interested in the mail from mom with pictures of the new puppy. They’re looking for that mail from a friend linking to a silly video. They’re deeply involved in an online discussion with friends or colleagues about anything at all.
This doesn’t mean they don’t want marketing in their inbox. Every subscription is an invitation to visit the recipient’s mailbox. They are inviting a sales person to visit them at home or at work;  spaces where marketers are not traditionally invited.
The problem is that a lot of email marketers do not respect the space they’ve been invited into. They assume, usually incorrectly, they are being given ownership of that space. The marketer sees the inbox as their marketing space, not as space that the recipient feels ownership over.
When someone buys a magazine or watches TV, there are a lot of ads, but that’s OK because they don’t feel any ownership of those spaces. But when they subscribe to something in email, they don’t cede ownership of their inbox to the senders. It is still their inbox and marketers are there only because the recipient invited them. The recipient will kick marketers out if they start writing on the walls or otherwise disrespecting their space.
Many delivery consultants talk about engagement and sending timely, relevant email. All of those are really coded phrases meaning “when you’re invited into somebody’s house don’t scrawl on the walls or poop on the carpets.”

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How to disable a domain

Sometimes you might want to make it clear that a domain isn’t valid for email.
Perhaps it’s a domain or subdomain that’s just used for infrastructure, perhaps it’s a brand-specific domain you’re only using for a website. Or perhaps you’re a target for phishing and you’ve acquired some lookalike domains, either pre-emptively or after enforcement action against a phisher, and you want to make clear that the domain isn’t legitimate for email.
There are several things to check before disabling email.
1. Are you receiving email at the domain? Is anyone else?
Check the MX records for the domain, using “host -t mx example.com” from a unix commandline, or using an online DNS tool such as xnnd.com.
If they’re pointing at a mailserver you control, check to see where that mail goes. Has anything been sent there recently?
If they’re pointing at a mailserver that isn’t yours, try and find out why.
If there are no MX records, but there is an A record for the domain then mail will be delivered there instead. Check whether that machine receives email for the domain and, if so, what it does with it.
Try sending mail to postmaster@ the domain, for instance postmaster@example.com. If you don’t get a bounce within a few minutes then that mail may be being delivered somewhere.
2. Are you sending email from the domain? Is anyone else?
You’re more likely to know whether you’re sending mail using the domain, but there’s a special case that many people forget. If there’s a server that has as it’s hostname the domain you’re trying to shut down then any system software running no that server – monitoring software, security alerts, output from cron and so on – is probably using that hostname to send mail. If so, fix that before you go any further.
3. Will you need mail sent to that domain for retrieving passwords?
If there are any services that might have been set up using an email address at the domain then you might need a working email address there to retrieve lost passwords. Having to set email back up for the domain in the future to recover a password is time consuming and annoying.
The domain registration for the domain itself is a common case, but if there’s any dns or web hosting being used for the domain, check the contact information being used there.
4. How will people contact you about the domain?
Even if you’re not using the domain for email it’s quite possible that someone may need to contact you about the domain, and odds are good they’ll want to use email. Make sure that the domain registration includes valid contact information that identifies you as the owner and allows people to contact you easily.
If you’re hosting web content using the domain, make sure there’s some way to contact you listed there. If you’re not, consider putting a minimal webpage there explaining the ownership, with a link to your main corporate website.
5. Disabling email
The easiest way to disable email for a domain is to add three DNS records for the domain. In bind format, they look like:

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