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 <[email protected] <mailto:[email protected]>> 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.

Stephen


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