Just wanted to give fellow web hosts here a warning about the domain "ringcss.com" and customer "Gordon Valma". Just had the person sign up today, send a test email to yahoo, then once it was accepted start sending out quite a bit of spam:

2008-04-04 18:44:44 1JhvaO-0006MG-1Y <= johnerskine@ringcss.com U=apache P=local S=4821 id=0a49ba3fc99a0e3ed8640e2c04bf4e9c@localhost T="Please trust" from <johnerskine@ringcss.
com> for mr_johnerskine@***.com Bos@***.com Leaorydlz@***.com carrenzam@***.com and so on...
2008-04-04 18:46:33 1Jhvc9-0006WZ-Nj <= mrchen@ringcss.com U=apache P=local S=1573 id=f81a38e810221d6ad508bb66ae6d366e@localhost T="IT'S INPORTANT THAT YOU GET BACK TO ME ASAP"
from <mrchen@ringcss.com> for ***@yahoo.com riste***@yahoo.com rist***@yahoo.com ri*@yahoo.com rita**@yahoo.com rita***@yahoo.com and so on...
I was able to cut it off fairly early however.

Be vigilant!