This is completely off topic from this thread, but one way to easily cut down on...

jsjohnst on July 16, 2017 | parent | context | favorite | on: Apache Foundation disallows use of the Facebook “B...

This is completely off topic from this thread, but one way to easily cut down on spam (that would break many email senders today) would be to require that a mail server can only send email for a domain you own. Yes, I'm familiar with DKIM and similar tools, but they don't go far enough.

codedokode on July 17, 2017 [–]

Another way is to accept emails only from your contact list.