What i do if i received email from same email id from your domain name?

If you are receiving same email from your domain name, it is most probably that your local network is infected with open proxy.
Important actions to be taken:
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1) Keep your local system free from virus and malware
2) Always use genuine OS in your system
3) Use anti-virus,firewall and anti-malware tools to protect your system
4) Always use tough passwords like 3r48d*#R#T&3023r
5) Keep Changing the passwords for mails.
6) Make sure your computer and computers on your network are virus and malware free.
7) Make sure your website is free of malware and security vulnerabilities. If you are using a third party script or code on your site, this usually means running the latest secure version
8) Start using ssl authentication for email ids.
9) Firewall which blocks all ports other than regular ports can be activated
Now the compromised systems which are configured to access or download emails are used to hijack email ids. Using these hijacked email ids, hacker demand ransom. This is more prominent in email ids that have very very weak password or using same password for all email ids.
If you receive any suspicious mail, please do not open or respond to that mail. Please check the headers in full and it might have come from other IPs. Such mails are reported common when users use simple email password without any special characters in them.
For safety, first reset all your password in that account including email, database, cpanel etc. Mostly such attacks happen at the users mobile or system when they use an outdated or unprotected OS or devices.
It is very important for you to maintain your website, email, database backup in multiple locations preferably in external devices like USB and hard disk and keep it safe. Also note that having multiple backup is a must for your business continuity. You can start taking backup in your control panel and download it via ftp. Even if you have cpanel backup enabled in the server we advice you to take the backup locally and keep it safe.