郵件伺服器警告日誌
Nov 28 14:14:32 extmail postfix/smtpd: warning: 218.20.147.195: hostname 195.147.20.218.broad.gz.gd.dynamic.163data.com.cn verification failed: Name or service not known
Nov 28 14:21:11 extmail postfix/smtpd: warning: 59.35.66.107: hostname 107.66.35.59.broad.st.gd.dynamic.163data.com.cn verification failed: No address associated with hostname
Nov 28 14:21:22 extmail postfix/smtpd: warning: 59.35.66.107: hostname 107.66.35.59.broad.st.gd.dynamic.163data.com.cn verification failed: No address associated with hostname
Nov 28 14:22:29 extmail postfix/smtpd: warning: 193.33.62.217: hostname nat-pool.prokma.ru verification failed: No address associated with hostname
Nov 28 14:27:00 extmail postfix/smtpd: warning: 219.135.129.183: hostname 183.129.135.219.broad.gz.gd.dynamic.163data.com.cn verification failed: Name or service not known
我的伺服器日誌裡面很多這樣的警告，請問所所么原因？
《解決方案》
還有錯誤日誌，
Nov 26 20:11:58 extmail spamd: rules: failed to run header tests, skipping some: syntax error at (eval 400) line 11, near ";
Nov 27 03:30:50 extmail postfix/smtpd: too many errors after RCPT from cpe-75-187-201-78.neo.res.rr.com
Nov 28 11:58:43 extmail spamd: Can't continue after import errors at /usr/lib/perl5/site_perl/5.8.8/Mail/SpamAssassin/Plugin/MIMEEval.pm line 22
Nov 28 11:58:44 extmail spamd: rules: failed to run header tests, skipping some: syntax error at (eval 393) line 11, near ";
Nov 28 11:58:44 extmail spamd: rules: failed to run header tests, skipping some: syntax error at (eval 394) line 11, near ";
Nov 28 11:58:44 extmail spamd: rules: failed to run header tests, skipping some: syntax error at (eval 395) line 11, near ";
Nov 28 11:58:44 extmail spamd: rules: failed to run header tests, skipping some: syntax error at (eval 396) line 11, near ";
