> 99.999999999% Eleven nines is very excessive. Frankly even six nines would still feel excessive, though I’m sorry to say that five might not be any more. Fif

> 99.999999999% Eleven nines is very excessive. Frankly even six nines would still feel excessive, though I’m sorry to say that five might not be any more. Fifteen years ago, I think even three nines would have been excessive. Legitimate outgoing SMTP was fairly common in those days, and botnet SMTP probably proportionally rarer. You know what, even one nine might have been excessive less than twenty years ago.