I have no problem breaking bounce/redirect. Yes, it has its uses, but
so do open relays, which we don't have anymore. The current levels of
mail abuse means that it's necessary to throw away a little baby with
the bathwater to keep the toxic waste out of the bath.
sorry, this is a nonstarter. being able to set a forwarding address is
extremely important, and breaking Sender is indefensible. (Sender is
useless unless it preserves the original identity of who or what sent
the message.)
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