What is Exim? How to install Exim (MTA)

Exim is a open source Mail Transger Aget,  it is compatible with Linux/CentOS. It is responsible for receiving, routing, and delivering e-mail messages. MTAs receive e-mail messages and recipient addresses from local users and remote hosts, perform alias creation and forwarding functions, and deliver the messages to their destinations. Exim security record is much better than sendmail.

How to install Exim.

# wget http://epel.mirror.net.in/epel/6/x86_64/epel-release-6-8.noarch.rpm

# rpm -ivh epel-release-6-8.noarch.rpm

# yum install -y exim-mysql

# service postfix stop
# chkconfig postfix off

# chkconfig exim on

# service exim start

Exim’s files location:

Configuration File : /etc/exim/exim.conf
Main Log File : /var/log/exim/main.log
Panic Log File : /var/log/exim/panic.log

Thats it.

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Exim: remote_smtp defer (-53): retry time not reached for any host

This can be caused by multiple things, however if it happens for each email, it’s likely your exim databases are corrupt; to resolve this you should:

/usr/sbin/exim_tidydb -t 1d /var/spool/exim retry > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim reject > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim wait-remote_smtp > /dev/null

/scripts/courierup -- force
/scripts/eximup --force