Month: April 2011

Exim is a message transfer agent (MTA) and widely used an alternative for sendmail.

Sometimes, there is no problem in sending emails but emails are not recieved at recievers end.

The first you should do is to check the exim mainlog using following command

tail -f /var/log/exim_mainlog

If you can see the error as below

2011-04-22 01:30:47 H=mail-xxx-xxx.domain.com [xx.xx.xx.xx]:48944 I=[yy.yy.yy.yy]:25F=<email@domain.com> temporarily rejected RCPT <email@example.com>: lowest numbered MX record points to local host

Fix:

The first thing is to check whether the domain exists under

/etc/localhost

or not.Read More »

Rootkit (RkHunter) scanner is scanning tool to ensure you for about 99.9%* you're clean of nasty tools.
This tool scans for rootkits, backdoors and local exploits by running tests like:MD5 hash compare, Look for default files used by rootkits, Wrong file permissions for binaries,Look for suspected strings in LKM and KLD modules, Look for hidden files,Optional scan within plaintext and binary files.
Rootkit Hunter is released as GPL licensed project and free for everyone to use.

Let us see  the installation of Rootkit Hunter in detail.

RKHUNTER Installation steps

1) Download  latest Rootki Hunter setup from http://sourceforge.net/projects/rkhunter/

root@server[#]wget http://space.dl.sourceforge.net/project/rkhunter/rkhunter/1.3.8/rkhunter-1.3.8.tar.gz

Read More »