Over the past year, I’ve seen MailChimp grow and grow. Along with all our new users, it seems like we see bigger and bigger lists every month.  In terms of email volume, our current daily average is now higher than our daily peak was one year ago.  To keep up with this explosion, we’re warming up new IPs which means more queues and more connections for our users.  Instead of asking everyone to deal with longer wait times, we’re actually trying to speed things up.

That leads to a very interesting question… How are we doing?  After sifting through 500 or so IPs and crunching the numbers on over a quarter of a billion emails, I might have an answer.  There are graphs with colored lines and all kinds of explanations below, but within my data set one thing is true.  75% of the emails we receive are delivered within 5 minutes or less.  That’s pretty cool.

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A couple days ago, Comcast sent an email asking for feedback about their feedback loop. Rare to see an ISP genuinely asking email senders what they think. Anyway, this meant I got to speak with one of their senior spam analysts on the phone today. Now I’ve spoken with a lot of ISPs, and I can tell you this was unlike any other conversation I’ve ever had. Comcast was human. Friendly, even. It was refreshingly Comcastic.

He gave me some tips that I could pass on to our readers. So here you go:

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A few of our customers have been asking us about this bit of news from ReturnPath: AOL Changes Authentication and Whitelist Standards.

According to George Bilbrey, AOL, Gmail, and Yahoo have implemented DKIM email authentication.

For those of you who don’t know, authentication is a way to prevent email forgeries, and it can improve your deliverability. The AOTA says Authentication has hit its “tipping point.”

Since 2004, when email authentication started to really pick up steam, ISPs have been testing (and changing) their support for authentication. Some use one method for inbound, and another for outbound. Some support all methods of authentication. Some have abandoned it, or are in limbo. It can be confusing.

So we compiled a chart of which ISPs are using which authentication methods over here.

Of course, we’ve also made authentication “MailChimp Easy:” Our customers can authenticate their email campaigns with one simple click, and we cover all the major authentication standards (DKIM, Domain Keys, SenderID, and SPF).