Recent Posts

Yahoo delays, part 3: Yahoo speaks

Yahoo is aware of the recent problems and have been working feverishly to fix them. A Yahoo employee posted to a mailing list earlier today, explaining some of the recent issues. The summary is:
1) The Yahoo delays are a result of a tighter spam filtering policy. The delays are the result of the system erroneously recognizing email as spam and deferring delivery. They do believe that retrying long enough will result in all mail being delivered to Yahoo recipients.
2) They have been continually making fixes to the system over the last few days and senders should see queues start to empty over the next few hours.
3) They believe the adjustments made will resolve the deferral problems. If you continue to see problems, you can contact them through the form at http://postmaster.yahoo.com/.
4) They are working to provide more self-serve information at http://postmaster.yahoo.com/ as well as timely service updates.
Loose ends from my previous Yahoo posts:

Read More

Yahoo delays, part 2

A number of people have posted to various mailing lists and made blog posts pointing to the Yahoo Mail blog post discussing recent problems Yahoo was having with mail. The general feeling seemed to be “AHA! That’s what is wrong!”
Unlike many of my peers, I do not think this explains the delivery problems senders have been seeing while attempting to deliver mail to Yahoo. The Yahoo mail blog article is talking about the Yahoo outgoing mailservers (smarthosts) for their non-webmail users. It is extremely unlikely that these are the same servers used for incoming email.
While I sympathize with everyone who had the AHA! moment and thought their delivery problems were being acknowledged and addressed by Yahoo! I do not think this is really what that blog post is saying.
I am hearing from people that Yahoo is aware of a problem with delayed incoming email, and they are working on fixing it. This does seem to be a broader problem than just bulk mailers, I am hearing from small and mid-size ISPs that they are having significant problems delivering email to Yahoo, too.
For more information about what Yahoo is doing to filter mail check out my previous post Greylisting: that which Yahoo! does not do.

Read More

Yahoo delays

You may have noticed increase in delays and rejections from Yahoo. I am certainly seeing a lot of customers complaining and hearing a lot of other delivery people commenting on problems getting mail into Yahoo. I have even heard from multiple ISPs that are struggling with full queues and delayed email.
No solutions or suggestions right now, just that everyone is having problems right now. I expect it will take some time for the backlogs to dissipate, even after the underlying problem is fixed. If I hear anything more I will post it here.

Read More

Ironport response

Last week I posted about a ESP that had a misconfiguration in their Ironport A60s that let spammers use the A60s to relay email to AOL. Earlier this week, Pat Peterson from Ironport approached me to talk about the problem and clarify what happened.
Ironport has provided me with the following explanation.

Read More

How to be a spammer

JD had a comment on my Valentines day semi-fluff post, that really summed up the reality for senders. He said

Read More

Valentine's day semi-fluff

There comes an inevitable point in some of my longer term consulting gigs where my client asks me some version of the following question:

Read More

Articles I read today

It has been a rather busy day today, I do not have a full blog post. I did see a couple posts come across my RSS feeds. Both of them have content I want to talk about and discuss in a little more detail, as I think they touched on some very interesting issues.
Network World has an article interviewing Mark Risher from Yahoo. The article discusses Yahoo’s use of DomainKeys as part of their inbound mail filtering.
Mickey has an article about how to deal with ISPs when attempting to troubleshoot a blocking issue.
More details and commentary on both articles later this week.

Read More

ESP unwittingly used to send spam

Late last week I heard from someone at AOL they were seeing strange traffic from a major ESP, that looked like the ESP was an open relay. This morning I received an email from AOL detailing what happened as relayed by the ESP.

Read More

Email authentication

The great folks over at MailChimp have compiled a list of which authentication methods (DK, DKIM, SPF and SenderID) are in use at which ISPs.
Good stuff and very clear showing who is using what authentication.

Read More

CAN SPAM compliance.

Over on the ET blog, Al posted about how CAN SPAM compliance is not sufficient for you to not be spamming.
It’s a bit different perspective, but very complimentary to my post yesterday about what is and is not spam. He and I have both heard from ISP people about how many requests for whitelisting or unblocking are prefaced with, “We comply with CAN SPAM” and how meaningless that statement really is. Al has a longer discussion of why.

Read More
Categories
Tags