IMAP是支持POP3和IMAP两种协议的，在安装Linux时，如没有把它装好，可以通过以下方法安装。
把Red Hat Linux7.0的光盘放入执行以下指令：
# mount /dev/dcrom /mnt/cdrom
# cd /mnt/cdrom/RedHat/RPMS
# rpm -i imap-4.7c2-12.i386.rpm
# cd
# umount /mnt/cdrom
# vi /etc/services '把pop2、pop3、imap2前面的#号去掉
# cd /etc/xinetd.d
分别生成imap、ipop3、ipop2三个文件，文件内容如下：
service imap
{
socket_type = stream
wait = no
user = root
server = /usr/sbin/imapd
log_on_success += DURATION USERID
log_on_failure += USERID
disable = no
}
service pop2
{
socket_type = stream
wait = no
user = root
server = /usr/sbin/ipop2d
log_on_success += USERID
log_on_failure += USERID
disable = no
}
service pop3
{
socket_type = stream
wait = no
user = root
server = /usr/sbin/ipop3d
log_on_success += USERID
log_on_failure += USERID
disable = no
}
执行如下指令，要求xinetd程序重新读取设定文件:
# /etc/rc.d/init.d/xinetd reload
# telnet localhost 143
测试一下看看imap进程起了没有，正确的应该会出现下面的界面
trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK localhost IMAP4rev1 v12.264 server ready