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Email Delivery Issue: The account or domain may not exist, they may be blacklisted, or missing the proper DNS entries

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Email Delivery Issue: The account or domain may not exist, they may be blacklisted

Nixtree Team comes across a wide range of issues to offer appropriate solutions to our clients. There was one interesting one. Our client faced the following error, while sending mail to another domain.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  my_test_user@test_domain.com.au
    The mail server could not deliver mail to my_test_user@test_domain.com.au. 
The account or domain may not exist, they may be blacklisted, or missing the
proper dns entries.

The first instinct is to think the domain name does not exist or does not have a MX record. Most of this is the case. While checking mx for the domain, I noticed that the MX is pointing to an IP.

#dig MX test_domain.com.au +short
192.168.0.1

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Output alignment problem for ‘df’ command

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Sometimes we need to get the output of df command in an arranged manner to use the output in some scripting or not. You can use the following command to view the output in properly formatted form.

df -Ph

   -P, --portability use the POSIX output format
   -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)

You can check the following screenshots for more details.

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cPanel/WHM Successful logins

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For getting the successful cPanel/WHM logins, using the following commands. For getting the successful cPanel logins. cat /usr/local/cpanel/logs/session_log | grep “myuser” | grep “NEW .*app=cpaneld” # “myuser” is cPanel username xx.xx.xx.xx [09/11/2015:13:17:40 -0000] NEW myuser:bOMyuserz8hKvThis1XUgnISnh4AWMMXSampleKgHE3lString1JpnOSiK5a45t3 address=122.165.84.98,app=cpaneld,creator=myuser,method=handle_form_login,path=form,possessed=0 For gettign successful WHM logins cat /usr/local/cpanel/logs/session_log | grep “root” | grep “NEW .*app=whostmgrd” # Use required WHM user … Read more

Plesk Roundcube error :Unable to connect to the database

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Sometimes you may come across with such an error displayed while going to webmail interface. This can be for both horde or roundcube. DATABASE ERROR: CONNECTION FAILED! Unable to connect to the database! Please contact your server-administrator To Fix this issue , you need to update the rouncube or horde user password in mysql.user table … Read more

Add extra swap to linux server

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If every server had plenty of RAM in the real world that does not happen. If for some reason you have a server with too little SWAP or you are hitting the max of the swap. Here is a quick way to add 1GB swap to the server. dd if=/dev/zero of=/usr/swapfilesys bs=1024 count=1024000 mkswap /usr/swapfilesys … Read more

Prevent .htaccess file modification while running easyapache

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Most of the time, the recompilation process of Apache/php with Easyapache with WHM/cPanel server will be effected the users’ .htaccess file. Most probably the entries like “AddHandler” will be commented state. We can prevent the .htaccess file modification from the WHM tweak settings. In WHM-> Server Configuration -> Tweak Settings -> System set Depth to … Read more

Change Site IP in cPanel

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Change Site IP via WHM Go to WHM > Change site’s IP Address , select the account, then select the IP Change Site IP via Command Line in cPanel /usr/local/cpanel/bin/setsiteip -u $USER $IP For moving all accounts in a server from one Ip to another using the following script; #! # https://www.nixtree.com # Contact [email protected] … Read more