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@Jerry@hear-me.social
Oh yes.
I can’t check, but I think there is setting to refuse connexion with the sender server if SPF doesn’t mach.
Like the policy in the DMARC?

Or, in spamd/spamassassin, to just drop the incoming email in these case?

(I’m on phone, I may write more wrongly than usual)

@Jerry@hear-me.social
There is 2 mechanisms against this.

• SPF
• Signature with DKIM
  Your provider should check these.
  Many providers don’t accept email if one is missing or wrong, or flag theses emails as spam.