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421 HL:REP ¸ÃIP·¢ËÍÐÐΪÒì³££¬´æÔÚ½ÓÊÕÕß´óÁ¿²»´æÔÚÇé¿ö£¬±»ÁÙʱ½ûÖ¹Á¬½Ó¡£Çë¼ì²éÊÇ·ñÓÐÓû§·¢ËͲ¡¶¾»òÕßÀ¬»øÓʼþ£¬²¢ºË¶Ô·¢ËÍÁбíÓÐЧÐÔ£»
?421 HL:ICC ¸ÃIPͬʱ²¢·¢Á¬½ÓÊý¹ý´ó£¬³¬¹ýÁËÍøÒ×µÄÏÞÖÆ£¬±»ÁÙʱ½ûÖ¹Á¬½Ó¡£Çë¼ì²éÊÇ·ñÓÐÓû§·¢ËͲ¡¶¾»òÕßÀ¬»øÓʼþ£¬²¢½µµÍIP²¢·¢Á¬½ÓÊýÁ¿£»
?421 HL:IFC ¸ÃIP¶ÌÆÚÄÚ·¢ËÍÁË´óÁ¿Ðżþ£¬³¬¹ýÁËÍøÒ×µÄÏÞÖÆ£¬±»ÁÙʱ½ûÖ¹Á¬½Ó¡£Çë¼ì²éÊÇ·ñÓÐÓû§·¢ËͲ¡¶¾»òÕßÀ¬»øÓʼþ£¬²¢½µµÍ·¢ËÍÆµÂÊ£»
?421 HL:MEP ¸ÃIP·¢ËÍÐÐΪÒì³££¬´æÔÚ´óÁ¿Î±Ôì·¢ËÍÓòÓòÃûÐÐΪ£¬±»ÁÙʱ½ûÖ¹Á¬½Ó¡£Çë¼ì²éÊÇ·ñÓÐÓû§·¢ËͲ¡¶¾»òÕßÀ¬»øÓʼþ£¬²¢Ê¹ÓÃÕæÊµÓÐЧµÄÓòÃû·¢ËÍ£» ?450 MI:CEL ·¢ËÍ·½³öÏÖ¹ý¶àµÄ´íÎóÖ¸Áî¡£Çë¼ì²é·¢ÐųÌÐò£» ?450 MI:DMC µ±Ç°Á¬½Ó·¢Ë͵ÄÓʼþÊýÁ¿³¬³öÏÞÖÆ¡£Çë¼õÉÙÿ´ÎÁ¬½ÓÖÐͶµÝµÄÓʼþÊýÁ¿£» ?450 MI:CCL ·¢ËÍ·½·¢Ëͳ¬³öÕý³£µÄÖ¸ÁîÊýÁ¿¡£Çë¼ì²é·¢ÐųÌÐò£»
?450 RP:DRC µ±Ç°Á¬½Ó·¢Ë͵ÄÊÕ¼þÈËÊýÁ¿³¬³öÏÞÖÆ¡£Çë¿ØÖÆÃ¿´ÎÁ¬½ÓͶµÝµÄÓʼþÊýÁ¿£»
?450 RP:CCL ·¢ËÍ·½·¢Ëͳ¬³öÕý³£µÄÖ¸ÁîÊýÁ¿¡£Çë¼ì²é·¢ÐųÌÐò£»
?450 DT:RBL ·¢ÐÅIPλÓÚÒ»¸ö»ò¶à¸öRBLÀï¡£Çë²Î¿¼http://www.rbls.org/¹ØÓÚRBLµÄÏà¹ØÐÅÏ¢£»
?450 WM:BLI ¸ÃIP²»ÔÚÍøÒ×ÔÊÐíµÄ·¢Ë͵ØÖ·ÁбíÀ ?450 WM:BLU ´ËÓû§²»ÔÚÍøÒ×ÔÊÐíµÄ·¢ÐÅÓû§ÁбíÀ
?451 DT:SPM ,please try again ÓʼþÕýÎÄ´øÓÐÀ¬»øÓʼþÌØÕ÷»ò·¢ËÍ»·¾³È±·¦¹æ·¶ÐÔ£¬±»ÁÙʱ¾ÜÊÕ¡£Çë±£³ÖÓʼþ¶ÓÁУ¬Á½·ÖÖÓºóÖØÍ¶Óʼþ¡£Ðèµ÷ÕûÓʼþÄÚÈÝ»òÓÅ»¯·¢ËÍ»·¾³£» ?451 Requested mail action not taken: too much fail authentication µÇ¼ʧ°Ü´ÎÊý¹ý¶à£¬±»ÁÙʱ½ûÖ¹µÇ¼¡£Çë¼ì²éÃÜÂëÓëÕʺÅÑéÖ¤ÉèÖã»
?451 RP:CEL ·¢ËÍ·½³öÏÖ¹ý¶àµÄ´íÎóÖ¸Áî¡£Çë¼ì²é·¢ÐųÌÐò£» ?451 MI:DMC µ±Ç°Á¬½Ó·¢Ë͵ÄÓʼþÊýÁ¿³¬³öÏÞÖÆ¡£Çë¿ØÖÆÃ¿´ÎÁ¬½ÓÖÐͶµÝµÄÓʼþÊýÁ¿£» ?451 MI:SFQ ·¢ÐÅÈËÔÚ15·ÖÖÓÄڵķ¢ÐÅÊýÁ¿³¬¹ýÏÞÖÆ£¬Çë¿ØÖÆ·¢ÐÅÆµÂÊ£»
?451 RP:QRC ·¢ÐÅ·½¶ÌÆÚÄÚÀۼƵÄÊÕ¼þÈËÊýÁ¿³¬¹ýÏÞÖÆ£¬¸Ã·¢¼þÈ˱»ÁÙʱ½ûÖ¹·¢ÐÅ¡£Çë½µµÍ¸ÃÓû§·¢ÐÅÆµÂÊ£»
?451 Requested action aborted: local error in processing ϵͳÔÝʱ³öÏÖ¹ÊÕÏ£¬ÇëÉÔºóÔٴγ¢ÊÔ·¢ËÍ£»
?500 Error: bad syntaxU ·¢Ë͵ÄsmtpÃüÁîÓï·¨ÓÐÎó£» ?550 MI:NHD HELOÃüÁî²»ÔÊÐíΪ¿Õ£»
?550 MI:IMF ·¢ÐÅÈ˵ç×ÓÓʼþµØÖ·²»ºÏ¹æ·¶¡£Çë²Î¿¼http://www.rfc-editor.org/¹ØÓÚµç×ÓÓʼþ¹æ·¶µÄ¶¨Ò壻
?550 MI:SPF ·¢ÐÅIPδ±»·¢ËÍÓòµÄSPFÐí¿É¡£Çë²Î¿¼http://www.openspf.org/¹ØÓÚSPF¹æ·¶µÄ¶¨Ò壻
?550 MI:STC ·¢¼þÈ˵±ÌìµÄÁ¬½ÓÊýÁ¿³¬³öÁËÏÞ¶¨ÊýÁ¿£¬µ±Ìì²»ÔÙ½ÓÊܸ÷¢¼þÈ˵ÄÓʼþ¡£Çë¿ØÖÆÁ¬½Ó´ÎÊý£»
?550 RP:FRL ÍøÒ×ÓÊÏä²»¿ª·ÅÄäÃûת·¢£¨Open relay£©£»
?550 RP:RCL Ⱥ·¢ÊÕ¼þÈËÊýÁ¿³¬¹ýÁËÏ޶Çë¼õÉÙÿ·âÓʼþµÄÊÕ¼þÈËÊýÁ¿£»
?550 RP:TRC ·¢¼þÈ˵±ÌìÄÚÀۼƵÄÊÕ¼þÈËÊýÁ¿³¬¹ýÏÞÖÆ£¬µ±Ìì²»ÔÙ½ÓÊܸ÷¢¼þÈ˵ÄÓʼþ¡£Çë½µµÍ¸ÃÓû§·¢ÐÅÆµÂÊ£»
?550 DT:SPM ÓʼþÕýÎÄ´øÓкܶàÀ¬»øÓʼþÌØÕ÷»ò·¢ËÍ»·¾³È±·¦¹æ·¶ÐÔ¡£Ðèµ÷ÕûÓʼþÄÚÈÝ»òÓÅ»¯·¢ËÍ»·¾³£»
?550 Invalid User ÇëÇóµÄÓû§²»´æÔÚ£»
?550 User in blacklist ¸ÃÓû§²»±»ÔÊÐí¸øÍøÒ×Óû§·¢ÐÅ£» ?550 User suspended ÇëÇóµÄÓû§´¦ÓÚ½ûÓûòÕß¶³½á״̬£»
?550 Requested mail action not taken: too much recipient Ⱥ·¢ÊýÁ¿³¬¹ýÁËÏ޶ ?552 Illegal Attachment ²»ÔÊÐí·¢Ë͸ÃÀàÐ͵ĸ½¼þ£¬°üÀ¨ÒÔ.uu .pif .scr .mim .hqx .bhx .cmd .vbs .bat .com .vbe .vb .js .wshµÈ½áβµÄ¸½¼þ£»
?552 Requested mail action aborted: exceeded mailsize limit ·¢Ë͵ÄÐżþ´óС³¬¹ýÁËÍøÒ×ÓÊÏäÔÊÐí½ÓÊÕµÄ×î´óÏÞÖÆ£»
?553 Requested action not taken: NULL sender is not allowed ²»ÔÊÐí·¢¼þÈËΪ¿Õ£¬ÇëʹÓÃÕæÊµ·¢¼þÈË·¢ËÍ£»
?553 Requested action not taken: Local user only SMTPÀàÐ͵ĻúÆ÷Ö»ÔÊÐí·¢ÐÅÈËÊDZ¾Õ¾Óû§£»
?553 Requested action not taken: no smtp MX only MXÀàÐ͵ĻúÆ÷²»ÔÊÐí·¢ÐÅÈËÊDZ¾Õ¾Óû§£»
?553 authentication is required SMTPÐèÒªÉí·ÝÑéÖ¤£¬Çë¼ì²é¿Í»§¶ËÉèÖã»
?554 DT:SPM ·¢Ë͵ÄÓʼþÄÚÈݰüº¬ÁËδ±»Ðí¿ÉµÄÐÅÏ¢£¬»ò±»ÏµÍ³Ê¶±ðΪÀ¬»øÓʼþ¡£Çë¼ì²éÊÇ·ñÓÐÓû§·¢ËͲ¡¶¾»òÕßÀ¬»øÓʼþ£»
?554 DT:SUM ÐÅ·â·¢¼þÈ˺ÍÐÅÍ··¢¼þÈ˲»Æ¥Å䣻
?554 IP is rejected, smtp auth error limit exceed ¸ÃIPÑé֤ʧ°Ü´ÎÊý¹ý¶à£¬±»ÁÙʱ½ûÖ¹Á¬½Ó¡£Çë¼ì²éÑéÖ¤ÐÅÏ¢ÉèÖã»
?554 HL:IHU ·¢ÐÅIPÒò·¢ËÍÀ¬»øÓʼþ»ò´æÔÚÒì³£µÄÁ¬½ÓÐÐΪ£¬±»ÔÝʱ¹ÒÆð¡£Çë¼ì²â·¢ÐÅIPÔÚÀúÊ·Éϵķ¢ÐÅÇé¿öºÍ·¢ÐųÌÐòÊÇ·ñ´æÔÚÒì³££» ?554 HL:IPB ¸ÃIP²»ÔÚÍøÒ×ÔÊÐíµÄ·¢Ë͵ØÖ·ÁбíÀ
?554 MI:STC ·¢¼þÈ˵±ÌìÄÚÀÛ¼ÆÓʼþÊýÁ¿³¬¹ýÏÞÖÆ£¬µ±Ìì²»ÔÙ½ÓÊܸ÷¢¼þÈ˵ÄͶÐÅ¡£Çë½µµÍ·¢ÐÅÆµÂÊ£»
?554 MI:SPB ´ËÓû§²»ÔÚÍøÒ×ÔÊÐíµÄ·¢ÐÅÓû§ÁбíÀ ?554 IP in blacklist ¸ÃIP²»ÔÚÍøÒ×ÔÊÐíµÄ·¢Ë͵ØÖ·ÁбíÀï