What does this log file referrer line mean?

[dickbaker]

I have ads running in various places, and not all of them offer tracking, so on some sales I have to look at log files to see where the customer came from.

Today I ran across a line in the log file for a customer that I haven't seen before. It reads as follows:

ASPSESSIONIDSABDSBBA=MNCBNMBCABKOOOJGJMKNALNJ;
+__utma=143293219.1079357401.1316770677.1316770677.1316770677.1;
+__utmb=143293219.2.9.1316770694482;+__utmc=143293219;
+__utmz=143293219.1316770677.1.1.utmcsr=36ohk6dgmcd1n.yom.mail.yahoo.net|utmccn=(referral)
|utmcmd=referral|utmcct=/om/api/1.0/openmail.app.invoke/36ohk6dgmcd1n/5/1.0.35/us/en-US/view.html

Does anyone here recognize this, and can you tell me where the heck the customer came from, or even get close?

Thanks for any replies.

[edited by: tedster at 5:20 pm (utc) on Sep 25, 2011]
[edit reason] added line breaks - prevent side scroll [/edit]

[g1smd]

They looked at a link sent to them in their Yahoo! Mail.

[dickbaker]

Thanks, g1smd. I had thought of that (really), but didn't think anyone would buy from my site based on an email. I was wrong.

[g1smd]

It could have been a recommendation from a friend.

It could be they saw the product while at work and emailed a link to their home email for later.

There's many possibilities.

If you have a way to activate a post-sale customer survey for this customer, they might just tell you.