You can implement RBLs to fight spam too. Also like Stephen mentioned, if you don't already have SPF, DKIM and DMARC setup, this video may help you set them up:

https://www.youtube.com/watch?v=3Pld4ZQf9s4

Amit K Nepal
(OSCP, CISM, CISSP, RHCE, CCENT, C|EH, C|HFI, GIAC ISO 27000 Specialist)

On 6/14/2019 12:04 PM, Stephen Partington wrote:
Do you have DKIM and DMARC records as well?

On Fri, Jun 14, 2019 at 11:26 AM <kitepilot@kitepilot.com> wrote:
Hello all:
I run my own DNS and email servers.
I have the SPF records properly set but I am having a crippling amount of
email spoofing by spammers, how can I prevent that?   :(
Thanks
ET
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A mouse trap, placed on top of your alarm clock, will prevent you from rolling over and going back to sleep after you hit the snooze button.

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