{"created":"2023-05-25T05:23:27.214831+00:00","id":922,"links":{},"metadata":{"_buckets":{"deposit":"2fcf49e8-36f7-4e47-91ae-9415a58ab380"},"_deposit":{"created_by":3,"id":"922","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"922"},"status":"published"},"_oai":{"id":"oai:yamagata.repo.nii.ac.jp:00000922","sets":["34:36:174"]},"author_link":["3958","3957"],"item_3_alternative_title_18":{"attribute_name":"その他の言語のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"The Features of the Spam Emails from the Viewpoint of MTA"}]},"item_3_alternative_title_19":{"attribute_name":"タイトル（ヨミ）","attribute_value_mlt":[{"subitem_alternative_title":"MTA カラ ミタ SPAM メール ノ トクチョウ"}]},"item_3_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2010-02-15","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"36","bibliographicPageStart":"27","bibliographicVolumeNumber":"32","bibliographic_titles":[{"bibliographic_title":"山形大学紀要. 工学 = Bulletin of Yamagata University. Engineering"}]}]},"item_3_description_42":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"論文(Article)","subitem_description_type":"Other"}]},"item_3_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"In an attempt to investigate the features of spam emails from the viewpoint of MTA, experiments were\\nmade in 2009 with five real servers installed in Japan and a domain name under .jp. It has been found that\\nnot only did a group of spam emails arrive at the server with a high MX priority in the DNS, but also\\nanother did at the one with a low MX priority in comparable numbers and the remaining mails at the other\\nwith A record in one fewer number of digits. 99.99% of these spam emails came via IPv4 whereas only\\n0.01% via IPv6. The countries of origin where their IP addresses were assigned to most were Brazil, Korea,\\nVietnam, China and India in descending order. These five countries made up 42 % of all. 19% of envelope\\nfrom domains in the spam emails were identified as the destination domain. 51% of them had their existent\\ndomains, but were not reachable email addresses. Reachable addresses were 27% of all. Although SPF and\\nSender ID were registered in 31% and 35% of domains respectively, DomainKeys and DKIM were less than\\n0.05%. In one of the experiments in which greet pause was set, about 50% connections were disconnected\\nwithin 10 seconds. After that, the frequency of accumulated disconnections increased in a stair-step fashion\\nuntil almost all were eventually disconnected within 120 seconds.","subitem_description_type":"Other"}]},"item_3_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"3958","nameIdentifierScheme":"WEKO"}],"names":[{"name":"YAMAMOTO,  Hiroshi"}]}]},"item_3_publisher_32":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"山形大学"}]},"item_3_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00242991","subitem_source_identifier_type":"NCID"}]},"item_3_text_33":{"attribute_name":"出版者（ヨミ）","attribute_value_mlt":[{"subitem_text_value":"ヤマガタ ダイガク"}]},"item_3_text_34":{"attribute_name":"別言語の出版者","attribute_value_mlt":[{"subitem_text_value":"Yamagata University"}]},"item_3_text_43":{"attribute_name":"資源タイプ・ローカル","attribute_value_mlt":[{"subitem_text_value":"紀要論文"}]},"item_3_text_44":{"attribute_name":"資源タイプ・NII","attribute_value_mlt":[{"subitem_text_value":"Departmental Bulletin Paper"}]},"item_3_text_45":{"attribute_name":"資源タイプ・DCMI","attribute_value_mlt":[{"subitem_text_value":"text"}]},"item_3_text_46":{"attribute_name":"資源タイプ・ローカル表示コード","attribute_value_mlt":[{"subitem_text_value":"2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"山本,  広志"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2015-08-21"}],"displaytype":"detail","filename":"kiyoue-32-027to036.pdf","filesize":[{"value":"446.6 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"kiyoue-32-027to036.pdf","url":"https://yamagata.repo.nii.ac.jp/record/922/files/kiyoue-32-027to036.pdf"},"version_id":"510af908-2258-4f6e-973c-28db4a6b2df5"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"MTAから見たSPAMメールの特徴","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"MTAから見たSPAMメールの特徴"}]},"item_type_id":"3","owner":"3","path":["174"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-07-11"},"publish_date":"2014-07-11","publish_status":"0","recid":"922","relation_version_is_last":true,"title":["MTAから見たSPAMメールの特徴"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2023-05-25T06:19:06.797410+00:00"}