Am 08.02.2012 14:57, schrieb Peter Tselios: > 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?
this is not possible postfix has SASL active or not postfix rejectes a message or not and no, it makes no sense "a custom DSN, not the build-in error" because you have to reject a message that you will not accept how have this worked before? all users from machines in "mynetworks" if not you have a open relay if the machine is connected to the internet
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