The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Friday, September 07, 2007

Some more stats about graylisting

Some stats from the graylist daemon. I'm automatically accepting emails from Yahoo, AOL and BellSouth, plus three other servers that run problematic mailing lists—all other emails are going through the graylisting process. I've been running the daemon for almost 48 hours, with an embargo time of one hour, and cleaning out records that haven't seen activity for 12 hours (I check this every five minutes).

Current Graylist statistics
tuples 2684
graylisted 8217
whitelisted 22
graylist expired 5533
whitelist expired 0

About 0.3% of all emails that are subjected to the graylist process make it through to the whitelist. Of those 22 that got through, eight were spam (amazing! Spammers using a real SMTP server!) and of those, four were delivered to an actual in-use email address.

Not bad, considering I was averaging a few hundred (maybe even as high as a thousand) per day.

Another interesting bit—I limit the size of email addresses to 108 characters and so far, only one address has been truncated, yet still made it to the whitelist (it was a notification from Linked In) in 2½ hours despite coming from four different IP addresses.

It appears to be working rather well, although I do have some notes about stuff I'd like to add:

Next up—getting this implemented on one of The Company's domains.

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