I use a webhost for my email needs and light webhosting. The rule below helps filter out most of this garbage that appears to be coming from myself. Basically it checks the headers to see if contains the name of my domain (domain.com), AND does NOT contain "107." This is the first octet of my public ip. If this evaluation is true then the email did not originate from my network and gets delivered into the spam folder. There are some caveats to this. Cell phone service is att based so it too will start with the 107. Say if I sent an email to myself from a verizon or comcast ip, it would get flagged as spam.
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