Re: MTS transparency and anonymity

>> if anonymous@[] doesn't quite work, there are similar alternatives 
>> worth
>> considering.  among them are: anonymous@[0.0.0.0], 
>> anonymous@[127.0.0.1],
>> anonymous@[127.255.255.255], anonymous@[::0], and anonymous@[::1].
>
> These might be OK in the message header. In the envelope they are 
> likely
> to be rejected as invalid, because many sites put restrictions on the 
> use
> of domain literals, and checks on envelope addresses tend to be more
> thorough. In addition to that, many sites reject domains that do not 
> refer
> to globally routable addresses.

exactly so.  in the envelope I recommend that MAIL FROM:<> be used.  a 
lot of MTAs reject it these days, but they are clearly broken.