邮件服务器警告日志

1914

Nov 28 14:14:32 extmail postfix/smtpd[11465]: 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[11472]: 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[11472]: 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[11472]: 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[11506]: warning: 219.135.129.183: hostname 183.129.135.219.broad.gz.gd.dynamic.163data.com.cn verification failed: Name or service not known


我的服务器日志里面很多这样的警告，请问所所么原因？

1914

还有错误日志，
Nov 26 20:11:58 extmail spamd[2557]: rules: failed to run header tests, skipping some: syntax error at (eval 400) line 11, near ";
Nov 27 03:30:50 extmail postfix/smtpd[3171]: too many errors after RCPT from cpe-75-187-201-78.neo.res.rr.com[75.187.201.78]
Nov 28 11:58:43 extmail spamd[11063]: 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[11063]: rules: failed to run header tests, skipping some: syntax error at (eval 393) line 11, near ";
Nov 28 11:58:44 extmail spamd[11063]: rules: failed to run header tests, skipping some: syntax error at (eval 394) line 11, near ";
Nov 28 11:58:44 extmail spamd[11063]: rules: failed to run header tests, skipping some: syntax error at (eval 395) line 11, near ";
Nov 28 11:58:44 extmail spamd[11063]: rules: failed to run header tests, skipping some: syntax error at (eval 396) line 11, near ";