faked from addresses getting through to my lists

I've been using SmartList to run my mailing lists since 1997.
I've never had a problem with this until just a few days ago.

Recently spam is getting through to one of the lists I maintain by
faking the From: header to be from me.  They use my email address
but the name on the From: line is not me.

Is there a way to only allow mail from me to get through only if
it originates from my localhost?

TIA