Hallo, So far I have not implemented SMTP Auth for various reasons (on of them was the fact that I had no Postfix installed). Anyway, I would like to implement it, but since I have a relatively large base (>200K emails), I would like to do it in a non-disruptive way. I was thinking to implement something like a "bounce" message for each outgoing mail without authentication. That message will not stop the delivery of the email, but it will, simply, inform unauthenticated users about the fact that in a few days they will be forced to do so. When D-day comes, I would like to return to unauthenticated users a custom DSN, not the build-in error.
Is there any way to do it? If not, is there any other way to do it? B/R P.
