Hi > On 02 nov. 2019, at 19:44, John Schmerold <schmero...@gmail.com> wrote: > > I have a few email addresses that were valid 15 years ago, but they have been > invalid for 5+ years, we are rejecting them with a 450 message, my thought is > "Let's tie up this spammer's computer just a little bit" > > Good idea? Bad idea? Effective? Ineffective?
Bad senders being bad senders, I wouldn't bother tailoring a special policy for some particularly old email addresses. I've never seen any benefit against spammers and even non spamming B2C senders can try a decade old email address that is failing for years without removing it from their lists… pat
