grep -i imap.如果发现没有安装，那就把redhat 7.1第二张安装光盘放到光驱里.然后运行如下命令:
[root@testmail mail]# mount /dev/cdrom /mnt/cdrom
mount: block device /dev/cdrom is write-protected， mounting read-only
(Successful Mount of Read-Only Media)
mount上光盘后运行这个命令来安装这个包:rpm -Uvh /mnt/cdrom/RedHat/RPMS/imap-2000-9.i386.rpm.
[root@testmail mail]# rpm -Uvh /mnt/cdrom/RedHat/RPMS/imap-2000-9.i386.rpm
Preparing... ########################################### [100%]
1:imap ########################################### [100%]
再运行一次 rpm -aq
关键词：设置你的首台e-mail服务器(3)