I just put these "keys" into the local part of the email address, no additional protocol "fixes" needed. I can make up keys on the fly then add the filter for t

I just put these "keys" into the local part of the email address, no additional protocol "fixes" needed. I can make up keys on the fly then add the filter for them later whenever I get home. It is very obvious when a sender has sold or shared an address and I blackhole accordingly (this is actually extremely rare).