do you receive the activation mail from ptc sites?

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I registered on some ptc sites on these days. As normal they must send you an e-mail in order to activate or verify your account. Today for the third time in few days I joined to a site but I haven't received any mail from them. I sent mails to their users service, but I received no responses. Is someone in my same situation? And what about my unverified account? I hope they'll be automatically deleted. Do you think it's a problem of the site or of my mail? I obviously already checked the spam folder. The ptc sites give me the problems are: Wepclix, Ten Ads Plus and Infinitybux. Thanks for the attention and for sharing your opinions.