You can fix this by editing exim configuration file.

steps:
1. vi /etc/exim.conf
2. Find the bellow entry
#daemon_smtp_ports = 25 : 587
3. remove the comment
daemon_smtp_ports = 25 : 587
If the port is not mentioned in exim.conf, please add it.

You can fix this by correcting the PATH in Environment variables.

PATH %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\system32\wbem;C:\Program Files\Intel\DMIX;C:\Program Files\ClarisoftTechnologies\iMonitorPC;C:\Program Files\QuickTime\QTSystem

Change the above line as bellow

PATH C:\php;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\system32\wbem;C:\Program Files\Intel\DMIX;C:\Program Files\ClarisoftTechnologies\iMonitorPC;C:\Program Files\QuickTime\QTSystem

Login into you server with the root login details and run following command
[root@server]# /usr/local/cpanel/bin/rebuild_phpconf –current

If server is Suexec then result would look like
==============
DEFAULT PHP: 5
PHP4 SAPI: suphp
PHP5 SAPI: suphp
SUEXEC: enabled
==============
If you are not sure about Shell then you can also check the SuExec is enabled or not from your WHM. Login into your WHM and in the menu find Configure PHP and SuExec

Check the drop down box for “PHP 4/5 Handler” – and if beside that it says “suPHP” – then the sever is SuExec enabled.

If you don’t have server root login details or WHM access, then you can create a php file under your account from cPanel >> File Manager and change the permissions on that file to 777 and open it in a browser. If it gives 500 Internal Server Error, then most probably running suPHP.

As well as you can also create the phpinfo page under your account from your cPanel >> File manager For ex. phpinfo.php with the following code

After creating phpinfo.php page browse it http://yourdomainname.com/phpinfo.php and if it shows “ “Server API = Apache then server is not running PHP in Suexec mode” and if Server API = CGI the server is running PHP in Suexec mode.

You can recreate qmail’s queue by following the steps given below, but while recreating all the current messages will be removed from the queue and cannot be restored. So it is better to take backup of messages before starting.
Steps:
1. log into server and stop qmail – #/etc/init.d/qmail stop
2. cd /var/qmail/queue
3. rm -rf info intd local mess remote todo
4. mkdir mess
5. for i in `seq 0 22`; do
mkdir -p mess/$i
done
cp -r mess info
cp -r mess intd
cp -r mess local
cp -r mess remote
cp -r mess todo
chmod -R 750 mess todo
chown -R qmailq:qmail mess todo
chmod -R 700 info intd local remote
chown -R qmailq:qmail intd
chown -R qmails:qmail info local remote
6. Now start qmail— /etc/init.d/qmail start

To create email account on an Android Mobile Device, please follow the below steps.
1. From the Home screen, click on the gray Application button.
2. Click on Email.
3. Then Next.
4. Using the keyboard, enter:
Email Address
Your full email address
Password
Your email password
5. click Next.
6. Click IMAP Account or POP Account.
7. Enter the following:
Username
Your full email address
Password
Your email password
IMAP/POP Server
Your Incoming POP or IMAP Server
(Optional) Security type
SSL (Accept all certificates)
IMAP/POP path prefix
No changes required
Incoming port
IMAP without SSL –143
IMAP with SSL –993
POP without SSL –110
POP with SSL –995
8. Tap Next.
9. In Outgoing server settings type:
Server name
Your Outgoing SMTP Server
(Optional)Security type
SSL (Accept all certificates)
Outgoing port
Without SSL – one of the following:25, 80, 3535, 587
With SSL –465
Require sign-in
Select to enable
Username
Your full email address
Password
Your email password
10. click Next.
11. Choose desired Account Settings.
12. Choose desired additional settings on Set up email.
13. Click on Done.