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只要外部程序过滤之后不调用sendmail将邮件传回 即邮件就不会被发送,并且系统会自动退信。 但是邮件过滤程序要返回一个错误值
错误值有下面几种 定义在sys_exits.h文件内- #define EX__BASE 64 /* base value for error messages */
- #define EX_USAGE 64 /* command line usage error */
- #define EX_DATAERR 65 /* data format error */
- #define EX_NOINPUT 66 /* cannot open input */
- #define EX_NOUSER 67 /* addressee unknown */
- #define EX_NOHOST 68 /* host name unknown */
- #define EX_UNAVAILABLE 69 /* service unavailable */
- #define EX_SOFTWARE 70 /* internal software error */
- #define EX_OSERR 71 /* system error (e.g., can't fork) */
- #define EX_OSFILE 72 /* critical OS file missing */
- #define EX_CANTCREAT 73 /* can't create (user) output file */
- #define EX_IOERR 74 /* input/output error */
- #define EX_TEMPFAIL 75 /* temporary failure */
- #define EX_PROTOCOL 76 /* remote error in protocol */
- #define EX_NOPERM 77 /* permission denied */
- #define EX_CONFIG 78 /* configuration error */
- #define EX__MAX 78 /* maximum listed value */
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