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About a year ago I used a virgin email account to register for an mmorpg.com account. In the time that this account has been setup I have not used it for any other site sign ups, or have made it available in any way except for mmorpg.com.
I get at least 10-15 spam messages a day, either mmoprg.com is selling address lists or their contest sponsors are selling them. I use the same web mail (gmail.com) service for other accounts that are unused for anything but one specific site as well, and never receive any spam.
Has mmorpg.com or one of their sponsors harvested our addresses to sell to spammers?
If your sponsors have sold our contact info, you really should be attempting to determine who it is/was and STOP allowing them to sponsor contests.
P.S. Keep up the good work otherwise