For prevent spam emailing, if any cms is using please update to latest version.
After that follow the below steps
1) email sending should be authentication. You need to change this to smtp authentication mode.
2) You need to set the "from address" and the "reply-to address" to a valid email address of this server and you need to monitor that email account properly.
3) Restrict email sending for all posts / comments.
4) You need to check the "Email Trace" from the cpanel login for all the emails gone through your account and restict as and when required.
5) Add captcha security for any automated submission in your website.
6) Activate "Cloudflare" in your account which is freely available from our cpanel. This will increase performace and security of you account.
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