I'm definitely a stat junkie and the free Google Analytics definitely feeds my habit. Of course, that's just web stats. For email stats, I've kept my own (far shoddier) statistics. Here's some stats:
The consistency surprises me because of Mailinator's nature. Personally, I use it "now and then" - like when I need it. Maybe (maybe) once a week when I sign up for something. Its not the type of site that you just hang out and browse on. So interestingly, this "now and then" use spreads across its users in a very uniform way.
What's also interesting is how people find Mailinator. It would seem that people just "know about it". A very large percentage simply come directly to it. A smaller but notable percentage get there through Google. Stumbleupon give a surprising number of referrals (in fact, its 10 times the number of yahoo).
Note that Mailinator's Alexa rating averages around 30,000. I've seen it as good as 19,000 and as bad as 60,000 or so in the last year (seems to bounce a lot).
Sorry this section doesn't have such pretty graphs, like I said, this stuff is all home grown and far less pretty. Also - if you remember (from the architecture entry below) Mailinator's SMTP server is home-grown. That's one reason it can handle this volume but alas it is also a work in progress, thus some stats were lost at times - in other words, the following numbers are estimates although I feel they're still pretty representative.
Number of average emails per day: 1.234 million
Number of total emails for 2006: 450.74 million
Percentage rejected for same subject: 8.7%
Number of total emails for 2005: 280.68 million
Note that "same subject" means mailinator got emails with the exact same subject over and over and over (i.e., bulk email).
Obviously, spam is way way up. And honestly, the surge happened mostly in Q4 of 2006. If 2007 keeps on the track its on now, we'll be headed for (get this) - 1.29 BILLION emails for the year.
How's that for lotsa spam?
Assuming that each visitor only cared about 1 email each, that means of the 450 million emails we got, only about .5% were actually looked at. Or 172 or every 173 emails was crap that no one wanted!