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The cause for the problem can either be because that the MX DNS record for the domain zone of destination recipient (local host) is wrong, or because (most likely reason anyway) that during the verify sender and recipient condition in RCPT ACL phase, the example.com is not recognized as a local domain, nor is the remote host allowed to relay.

To solve the issue, check whether the domain MX record in DNS name servers to verify that it’s pointing to the correct mail server. If MX record is correct, ensure that the destination domain is properly designated as the local-domain to allow Sendmail or Exim to know that they suppose to receive the mail without querying DNS again. To do so, insert the affected domain to the server’s domain lists into the following config file, depending on your flavor of Linux or Windows OS, and which MTA you’re using.

/etc/localdomains (Exim)
/etc/mail/local-host-names (Sendmail)

Reference

http://www.mydigitallife.info/lowest-number-mx-record-points-to-local-host-rejected-rcpt-error/

Following commands can delete all mails from your qmail mail server queue.

qmailctl stop
find /var/qmail/queue/mess -type f -exec rm {} \;
find /var/qmail/queue/info -type f -exec rm {} \;
find /var/qmail/queue/local -type f -exec rm {} \;
find /var/qmail/queue/intd -type f -exec rm {} \;
find /var/qmail/queue/todo -type f -exec rm {} \;
find /var/qmail/queue/remote -type f -exec rm {} \;
qmailctl start

Do this when even you get time 🙂

the solution is below
go to /var/cpanel/serviceauth/

remove the directory exim

cd /var/cpanel/serviceauth/
rm -rf exim

Restart Cpanel.
/etc/rc.d/init.d/cpanel restart

The folder exim will be recreated…

that should fix the issue.

Reference
http://presoon.com/blog/2009/03/20/535-incorrect-authentication-data-exim-cpanel/

can not increase , in order to increase it then you need to install Suhosin
Please refer to this article for more details
http://forums.cpanel.net/f402/workaround-cve-2011-4885-php-5-2-17-a-258022.html

sudo yum install php-mbstring
sudo /sbin/service httpd restart

reference
http://drupal.org/node/125354

use the below command

/usr/local/cpanel/bin/dcpumonview

the below installation for Linux ( Centos)

rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

rpm -Uvh http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

yum install iftop

ps aux | awk ‘{print $4?\t”$11}’ | sort | uniq -c | awk ‘{print $2? “$1? “$3}’ | sort -nr | head

grep out_of_memory /var/log/messages

Please refer to below