Helped me a very big problem in the foe ( exim ) mail

Hello
I have a big problem in the server
Broken because he did not focus to whether it because I mistakenly through it
(yum remove exim )
And later, to Aasttia installed by it
(yum install exim )
The message is
root @ server [~] # yum install exim
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* Base: linux.mirrors.es.net
* Extras: linux.mirrors.es.net
* Updates: mirrors.versaweb.com
Excluding Packages in global exclude list
Finished
Setting up Install Process
No package exim available.
Nothing to do


plaaaase !! i need help

 

and
echo "very good" | mail -s "test" XXXXX@gmail.com

/usr/sbin/sendmail: No such file or directory

 

and

/scripts/exim4 --latest

not working

-bash: /scripts/exim4: No such file or directory