ã´ããã @goho___ ãè¿ä¿¡ä¸è¦ã§ããã§ã¯ãªããããä¸åããªããã°ããè¿ä¿¡ã«ã¯åã³ã¾ãããã¨ããæ¹ã®ã¡ã¼ã«ã«æåãã¦ãããããçä¼¼ããããã«ãã¦ãã¾ãã âè¦ããªãâã¨ããçªãæ¾ããå°è±¡ã§ã¯ãªããèªã¿çµããå¿ã温ãããªãã¡ã¼ã«ãæèãããã 2026-04-25 14:45:49
1. ã¡ã¼ã«èª¤éä¿¡ã®åå ã¯ãã¥ã¼ãã³ã¨ã©ã¼ ãããã2025å¹´ãè¿ãããã©ããªå¹´ã«ãªãã ããããä»å¹´ã¯ã2025å¹´ã®å´ãã訪ããå¹´ã¨è¨ããã¦ãããç¹ã«æ å ±ã·ã¹ãã é¨éã§ã¯ãã¨ã³ã¸ãã¢ã®å®å¹´éè·ãªã©ã«ãã人å¡ä¸è¶³ãæè¡ç¶æ¿åé¡ã§ãã¡ã³ããã³ã¹ãã§ããªãã·ã¹ãã ãæ±ãã伿¥ãå¢ããæ¢åã·ã¹ãã ã®ç¶æç®¡çãé£ãããªããããããããçµæã¨ãã¦ããã¸ã¿ã«ãã©ã³ã¹ãã©ã¼ã¡ã¼ã·ã§ã³ï¼DXï¼ã®æ¨é²ã妨ããããITç£æ¥ã®ä¸ã§é ããåã伿¥ãå¤ãåºãã¨äºæ³ããã¦ãããããã¦ã伿¥ã®ç«¶äºåãçµæ¸çå®å®æ§ã«æªå½±é¿ãåã¼ããã¨ãæ¸å¿µããã¦ãããæ¢ã«ä¼æ¥éã®æ ¼å·®ã¯AIæ´»ç¨ã®æç¡ã§é¡èã«ç¾ãã¦ããã®ã§ã¯ãªãã ãããããã®åé¡ã®è©³ç´°ã«ã¤ãã¦ã¯ãä»å¾ã®ã³ã©ã ã§ç´¹ä»ãããã ãã¦ãã2025å¹´ãã®1æ¬ç®ã¨ãªã仿¥ã®ã³ã©ã ã§ã¯ãã¡ã¼ã«èª¤é信対çã«ã¤ãã¦ã話ãããããæ ã·ã¹ã®å½¹å²ãã¾ãã¾ãéè¦ã«ãªãä»ã ãããããæ¹ãã¦æ¥å¸¸ã®æ¥å
å°±è·ããã伿¥ã»æ¥ç¨®ã©ã³ãã³ã°ãããã20ã¯å½å 伿¥ãç¬å ããªã¹ã¯ã¢ã³ã¹ã¿ã¼èª¿ã¹ã 4æ13æ¥ 6:30
æ¬ç¨¿ã¯ãã客æ§ããã貴社ãã¡ã¤ã³ããSPF/DKIMèªè¨¼ã失æãã¦ããã¡ã¼ã«ããããã¨ãé£çµ¡ãããã ããåå 調æ»ãè¡ã£ãéã®ç¥è¦ãå ±æè´ãã¾ãã ã¡ã¼ã«ã®ä»çµã¿ã£ã¦å¥¥ãæ·±ãã å æã§ãããã¾ãã ï¼ç¥ããªããã¨ãç¥ããã®ã¯æ¥½ããã§ããï¼ ã客æ§ãDMARCï¼Domain-based Message Authentication, Reporting and Conformanceï¼ã®ããªã·ã¼å¼·åãé²ããããä¸ã§ãå¼ç¤¾ãã¡ã¤ã³ã«é¢é£ããSPF/DKIMèªè¨¼å¤±æã®å ±åãåãã¾ããã çµè«ã¨ãã¦ãåå ã¯ãå¼ç¤¾å ã§ã®ã¡ã¼ã«è»¢éãã§ããããªããã¾ãã§ãã·ã¹ãã ã®ä¸å ·åã§ãããã¾ããã ãããããã®çµè«ã«è¾¿ãçãã¾ã§ã®èª¿æ»ããã»ã¹ã¨ãããã§å¾ãç¥è¦ã¯ãåããããªåãåãããåããæ¹ã®ãå½¹ã«ç«ã¤ãã¨æããè¨äºã«ã¾ã¨ãã¾ããã å 容ã«ã¤ãã¦ã®è«¸æ³¨æ ã客æ§ããã®ãåãåããå 容 DMARCã¨ã¯ï¼ããããï¼
Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? ã¯ããã« ã¡ã¼ã«ã»ãã¥ãªãã£ã®ç¨èªã£ã¦ãã¢ã«ãã¡ãããã°ããã§é£ããæãã¾ãããï¼ ã SPF ãã DKIM ãã DMARC ã...ã ã©ããéè¦ã ã¨è¨ããã¾ãããå ·ä½çã«ä½ããã¦ããã®ãã¤ã¡ã¼ã¸ãã¥ããã®ãæ£ç´ãªã¨ããã§ãã ãã®è¨äºã§ã¯ãå°éç¨èªã極å使ããã ç´æçãªã¤ã©ã¹ãã¨ä¾ã話 ã§ããããã®ä»çµã¿ããä¸çä¸ããããããã解説ãã¾ãã 1. SPF (Sender Policy Framework) ï¼ãæå¾ 客ãªã¹ãããæã£ããã¢ãã³ SPF ã¯ãã¡ã¼ã«ã® ãéä¿¡å ã®ä½æï¼IPã¢ãã¬ã¹ï¼ã ããã§ãã¯ããä»çµã¿ã§ãã ä¾
ã¯ããã« Webã¢ããªãæ¥åã·ã¹ãã ã«ã¡ã¼ã«éä¿¡æ©è½ãçµã¿è¾¼ãã¨ãå¿ ãã¨è¨ã£ã¦ããã»ã©åãåãããçºçãã¾ãã ãã¡ã¼ã«ãå±ãã¾ããã ãé å»¶ãã¦ããæ°ããã¾ãã ããããã¡ã¼ã«ã¯ HTTP ã®ãããªãªã¢ã«ã¿ã¤ã éä¿¡ã§ã¯ãªããéåæã§ä¸ç¶ãç¹°ãè¿ãã¡ãã»ã¼ã¸ã³ã°ã·ã¹ãã ã§ãã ãã®ãã â峿å±ãâ ã»ãããããä¾å¤ã§ãããé å»¶ã¯æ£å¸¸ç³»ã®ä¸é¨ã¨è¨ã£ã¦ãéè¨ã§ã¯ããã¾ããã æ¬è¨äºã§ã¯ãç¹ã« Postfix ãä¾ã«ããªããã ã¡ã¼ã«é å»¶ã¯ãªãèµ·ããã®ã MTA ã®å é¨ãã¥ã¼ã®ä»çµã¿ é å»¶ã®åå ãã¿ã¼ã³ ãã°ããã®èªã¿è§£ãæ¹ é å»¶ãæããããã®å®è·µçãªå¯¾ç ãå³è§£ãåããã¦å¾¹åºè§£èª¬ãã¾ãã 1. ã¡ã¼ã«ã¯ãªã¢ã«ã¿ã¤ã éä¿¡ã§ã¯ãªãï¼åæã®çè§£ï¼ HTTP éä¿¡ã¯åæç㪠API å¼ã³åºãã§ãããSMTP ã¯ç°ãªãã¾ãã SMTP ã¯ãã¡ãã»ã¼ã¸ãéµä¾¿ã®ããã«ä¸ç¶ãã¦ããæ¹å¼ãã§ãããMTA ãè¤
ãã®è¨äºã¯ãå¼è·å£«ãããã³ã Advent Calendar 2025 ã® 3 æ¥ç®ã®è¨äºã§ãã ã¯ã©ã¦ããµã¤ã³ SRE ãã¼ã ã®é²è¤ã§ãã ãã¡ã¼ã«éä¿¡è ã®ã¬ã¤ãã©ã¤ã³ãã®æ¹è¨ãæ©ã«ãDMARCããªãããªããå ¬éããã¦ããç´ 2 å¹´ãçµéãã¾ããããã¤ãã«ã¯ã©ã¦ããµã¤ã³ããµã¼ãã¹ã§å©ç¨ãã cloudsign.jp ã® DMARC ããªã·ã¼ã quarantine ã«å¤æ´ã§ãã¾ããã ããã§æ¬è¨äºã§ã¯ãDMARC ããªã·ã¼ã none ãã quarantine ã«å¤æ´ããã¾ã§ã®æµãã説æããå¾ã«ããã®éç¨ã§ã®èª¤ç®ãå¦ã³ãå ±æãã¾ãã ãããã DMARC ããªã·ã¼ã quarantine ã«å¤æ´ããæ¹ã ã®åèã«ãªãã°å¹¸ãã§ãã DMARC ããªã·ã¼ã none ãã quarantine ã«å¤æ´ããã¾ã§ã®æµã DMARC ã¬ãã¼ãåæç°å¢ã®æ§ç¯ DMARC ããªã·ã¼ã®å¤æ´ã«ããå½±é¿ã®äº
ã¯ããã«ããã«ã¡ã¯ãTIG-DXã®è¤äºã§ãã å½ç¤¾ã®æå¿ã¡ã³ãã¼ã®ååã«ãããã¢ã¼ããã¯ãã£è¨è¨ã¬ã¤ãã©ã¤ã³ã¨ãããã®ã使ã»å ¬éãã¦ãã¾ãã ååéã«ãããã¢ã¼ããã¯ãã£è¨è¨ã®æéã¨ãªãã¹ã使ããã¦ããã¬ã¤ãã©ã¤ã³éã§ããããã®åº¦ãæ°ãã«ã¡ã¼ã«è¨è¨ã¬ã¤ãã©ã¤ã³ã使ãã¾ããã æ¬è¨äºã§ã¯ããã®ã¡ã¼ã«è¨è¨ã¬ã¤ãã©ã¤ã³ã«ã¤ãã¦ãå 容ã«ã触ãã¤ã¤ãç´¹ä»ããã¦ããã¾ãã ã¡ã¼ã«è¨è¨ã¬ã¤ãã©ã¤ã³æ¦è¦çãããæ®æ®µããã¡ã¼ã«ã¯å©ç¨ããã¦ãããã¨æãã¾ãããã®æè»½ãã»å©ç¨è ã®å¤ããããç´ç²ãªã³ãã¥ãã±ã¼ã·ã§ã³ãã¼ã«ã¨ãã¦ã¯ãã¡ãããwebã·ã¹ãã ã«ãããã¦ã¼ã¶èªè¨¼ãã販ä¿ã»å種åå¼ãªã©ãå¤å²ã«ããã£ã¦æ´»ç¨ããã¦ãã¾ãã 䏿¹ãå®éã«ã¡ã¼ã«ã¨ããéä¿¡ææ®µãã©ã®ããã«å®ç¾ããã¦ããã®ãã»ã©ããã£ãæè¡ãå©ç¨ããã¦ããã®ããçãæèãããã¨ã¯ãã¾ãç¡ãã®ã§ã¯ãªãã§ããããã å½ç¶ã®ãã¨ã§ã¯ããã¾ãããã¡ã¼ã«
スー @su_agenaiyon ã¢ã«ã³ï½ï½ï½ï½ï½ï½ï½ï½å¯æãã£ã¦ããã¦ãä¸å¸ãããªãã£é®æãããããæ¥é±ä¼ãâã£ã¦ã¡ã¼ã«æ¥ã¦ã¦æ»ãã ï½ï½ï½ï½ï½ï½ï½ï½ï½ï½ï½ï½ç²¾ç¥ã¨é ã®å¿é ãã¦ããã¦ãããã¨ããããã¾ãï½ï½ï½ï½ï½ï½ï½ï½ï½ã»ãã§Twitterã«ã¡ã¼ã«è¼ããããâã£ã¦ç¢ºèªãã¦ããã£ã¦ãã®ã»ãã¾æ ããªãï½ï½ï½ï½ï½ï½ï½ï½ï½ï½ï½ pic.x.com/2uhk6YPAnl 2025-10-05 00:30:14
ãã¤ãYahoo!ã¡ã¼ã«ããå©ç¨ããã ããããã¨ããããã¾ãã æªæã®ãã第ä¸è ã«ãã£ã¦ã¡ã¼ã«ã¢ã«ã¦ã³ããä¹ã£åããã䏿£ã«ãã°ã¤ã³ããã¦ããã¨æãããã±ã¼ã¹ãå¢å ãã¦ãã¾ãã Yahoo!ã¡ã¼ã«ã«ããã¦ã対å¦ãé²ãã¦ããã¾ãããç¶æ³ã¯æ¥ã å¤åãã¦ããããèªèº«ã§å¯¾å¦ããããã¨ã§ãã©ãã«ãé²ããå¯è½æ§ãããé«ã¾ãã¾ãã ä»åã¯ãèªèº«ã§å¯è½ãªå¯¾å¦æ³ããæ¡å ãã¾ãããã²ãå½¹ç«ã¦ãã ããã ã¢ã«ã¦ã³ãä¹ã£åã被害ãå¼ãç¶ã髿°´æº Yahoo!ã¡ã¼ã«ãä»ç¤¾ã¡ã¼ã«ãµã¼ãã¹ã«ããã¦ãæ¢åã®ã¡ã¼ã«ã¢ã«ã¦ã³ãã®æ å ±ãç¨ãã¦ã第ä¸è ã«ããã¡ã¼ã«ãµã¼ãã¹ããã®ä»ã®ã¤ã³ã¿ã¼ããããµã¼ãã¹ã«ä¸æ£ã«ãã°ã¤ã³ããã被害ãå¼ãç¶ãå¤ãå ±åããã¦ãã¾ãã ãã®ãããªãã¢ã«ã¦ã³ãä¹ã£åããã«ããã以ä¸ã®ãããªè¢«å®³ãçºçããå¯è½æ§ãããã¾ãã ãã£ãã·ã³ã°ã¡ã¼ã«ã®éä¿¡å ã¨ãã¦ãæªæã®ãããµã¤ãã¸ã®èªå°ãå人æ å ±ã®èãåºãã«å©ç¨
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}