How to stop email spoofing?

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Author: PLUG-discuss
Date:  
To: Main PLUG discussion list
Old-Topics: Re: ClusterSSH in screen?
Subject: How to stop email spoofing?
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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