It is odd to revive a discussion from 10 years ago, but the question still seems to be unanswered.
Does anyone know how to disable NDR messages from UTM?
Like the original post, I am aware that NDRs can become backscatter SPAM, or facilitate directory harvesting. Is it possible that Sophos thinks this is unimportant?
It is odd to revive a discussion from 10 years ago, but the question still seems to be unanswered.
Does anyone know how to disable NDR messages from UTM?
Like the original post, I am aware that NDRs can become backscatter SPAM, or facilitate directory harvesting. Is it possible that Sophos thinks this is unimportant?
Official answer from support: Not possible.
(Although they pointed out that I can block incoming backscatter by enabling BATV, which I already use)
Has anyone tried disabling recipient verification? I wonder if it changes how bounces are handled, or if it just delays when the bounces occur.
Disabling recipient verification makes the mail server receive emails for non-existent accounts. I know that Exchange can handle them in different ways including bouncing them, but that would seem to be inefficient. It also can send an NDR or deliver such mail to a trashcan account. Others here know more about that than I.
Cheers - Bob