Someone from this IP address is using our domain to spam and we are getting thousands of returns, please see string below: Return-Path: <compras.lacasadelabascula.com@unisen-usa.com> Received-SPF: none (domain of unisen-usa.com does not designate permitted sender hosts) X-YMailISG: CsxaON4WLDtXA_USQO7cXa2PAgwZyyBiK5fAbWHUo2eM7apf N1egnpoTkNh7hvYrJAyCcEnie_S5Rgt_Xo_pJW7Fk3ngn5ZsA7OBsnKto555 x1_iPX2OgRorSq9dxF0BIHaBQJW7CsMHpteneYWMzbsjNxFOIi71FtT4sZsl PwjrWAAGSOdLfytNEeCy8WgHQ550hSKRaVxP2s6sRfrH7k9neHvaeLzeRPER 8zEHjo6MT850gS09mO7TGILPxOwlio5S8FGyO95hK9Ow8bl.2OkH.buo8cYt v.TF_ldf.CcpfUxHPoo.V8bH54SIRNSTyBYXFFV41Is2WOYYF3pi98fjzbd7 HthW3CXrmqtS_sBqjNG3a4NS2BJo9sbBEjKagihykvfm1HSXjvAxOCsrTklg 5Oy0SdXNfPGJcAzrFhMx0WeC.7uRi_DmWB.lrJZ_Bi_jQPArez86lEq71lc3 8mzRMRXDwxp9qBmcOgfQenNcRzW9oPMATKD247GRD8Ig94ilvKMLA4FQtH8K IvNtQbzE5a0gAw3OM8bHGqwzHr4W0mrxpyxLkyL77lRlxo6Gp1hzrJrg2ruS 07zmpuEWQ_n3J0LhgHM6Ctpmlnmank18Tptm7mDGFcIQcz2sgiww9cbnlMnk pJt0MmythsIWyjvGouvLWYE0wWqt0Zds2mviAbs6D3VsvmU9PWAp0s2Jc4eX luGA1llr6dzuAZwV0UX2mna3wa99WsvFafd32d9g33t8K5.rOpX7ymuTcTW3 Rk3zWs8khp7tFHRfT.Uqo0QNV.dttv3QQfcN1DrKlfDZiE8JeGAG4MMq4Nq5 fIpIITnpBJcGiz31HF.Ln9Xsy0TLPuUaPVrwU678.vJhUNxje0CQyi08LcCo qFUBUuf2LQ.TDKU1D.pjFB.0J2Ou_chaGFeF3OoEoS_a4Iw1xnJ_.sWkWhM4 7xfKA_GiVB7WxX3sUjRv1qyoFqL3ArVSViYMk1snRiJhQNS59qM2jJj578yK qMa_eI2azzbqac9aK8fiCqraKMURBPhWrNAV4iGr_UjCKIavwPjFrUXBPbkb rTOl45Cpw5NjDqMGdKsHBlTsVRrqvozJm851IMpbcZzs_CJxUr0JnhBIQJIb PgAfv6Ixen9TYUS0T6WKFohFyYEGqQ-- X-Originating-IP: [216.251.36.21] Authentication-Results: mta1035.mail.gq1.yahoo.com from=unisen-usa.com; domainkeys=neutral (no sig); from=unisen-usa.com; dkim=neutral (no sig) Received: from 127.0.0.1 (EHLO mail10c0.megamailservers.com) (216.251.36.21) by mta1035.mail.gq1.yahoo.com with SMTP; Sun, 15 Apr 2012 01:43:35 -0700 X-Authenticated-User: compras.lacasadelabascula.com Received: from qfqajho ([120.136.66.211])
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DNSBL* - is a list of IP addresses published through the Internet Domain Name Service (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
WHOIS** - is a query/response protocol that is widely used for querying databases in order to determine the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. WHOIS lookups were traditionally performed with a command line interface application, and network administrators predominantly still use this method, but many simplified web-based tools exist. WHOIS services are typically communicated using the Transmission Control Protocol (TCP). Servers listen to requests on the well-known port number 43.
** Approximate Geographic Location - This is NOT the exact geographical location of the person/organization with the given IP address. However, this should still give you a good idea about the area/region where this person/orgranization is located.