[root@arcade mail]# ls -l /etc/ | grep mail; ls -l /etc/mail; service sendmail start
drwxr-xr-x. 2 root root 4096 2011-01-27 20:06 mail
-rw-r--r-- 1 root root 272 2009-11-17 21:13 mailcap
-rw-r--r-- 1 root root 1968 2010-10-26 14:44 mail.rc
total 192
-rw-r--r-- 1 root root 469 2007-08-27 11:25 access
-rw-r-----. 1 root root 12288 2011-01-27 20:06 access.db
-rw-r--r--. 1 root root 0 2010-09-30 14:25 aliasesdb-stamp
-rw-r--r-- 1 root root 233 2007-04-12 15:35 domaintable
-rw-r-----. 1 root root 12288 2011-01-27 20:06 domaintable.db
-rw-r--r-- 1 root root 5584 2010-03-27 21:10 helpfile
-rw-r--r-- 1 root root 64 2007-04-12 15:35 local-host-names
-rw-r--r-- 1 root root 997 2007-04-12 15:35 mailertable
-rw-r-----. 1 root root 12288 2011-01-27 20:06 mailertable.db
-rwxr-xr-x 1 root root 2700 2008-12-19 13:23 make
-rw-r--r-- 1 root root 92 2008-12-03 18:29 Makefile
-rw-r--r-- 1 root root 58439 2010-03-27 21:10 sendmail.cf
-rw-r--r-- 1 root root 7202 2008-12-03 18:29 sendmail.mc
-rw-r--r-- 1 root root 41521 2010-03-27 21:10 submit.cf
-rw-r--r-- 1 root root 941 2010-03-27 21:09 submit.mc
-rw-r--r-- 1 root root 127 2007-04-12 15:35 trusted-users
-rw-r--r-- 1 root root 1847 2007-04-12 15:35 virtusertable
-rw-r-----. 1 root root 12288 2011-01-27 20:06 virtusertable.db
Starting sendmail: 451 4.0.0 /etc/mail/sendmail.cf: line 87: fileclass: cannot open '/etc/mail/local-host-names': Group writable directory
451 4.0.0 /etc/mail/sendmail.cf: line 596: fileclass: cannot open '/etc/mail/trusted-users': Group writable directory
[FAILED]
都不/etc/mail是/etc/mail/trusted-users组可写的。为什么 sendmail 会抱怨？
答案1
看起来你的/etc权限不对。权限应该是 755，并且由 root 拥有。因此，请执行以下命令并重试：
# chmod g-w /etc
# chown root:root /etc
答案2
请参阅 sendmail 附带的 README 文件：man sendmail
chmod go-w / /etc /etc/mail /usr /var /var/spool /var/spool/mqueue
http://www.textndata.com/forums/cant-startup-sendmail-help-61368.html
答案3
Fw/etc/mail/local-host-names用以下行替换
Fw-o /etc/mail/local-host-names
与
Ft/etc/mail/trusted-usersFt-o /etc/mail/trusted-users
在 sendmail.cf 和 submit.cf 中