What causes this type of address in envelopes?

[Steve Campbell]

OK, thanks to all.

It's sort of a problem in that it's not that easy to whitelist with that 
type of address, I'm not sure it they only have one server or IP they 
send from. It's clunky in my opinion.

Again, thanks

Steve

Denis Beauchemin wrote:
> Steve Campbell a écrit :
>> I have a little problem with a from envelop address. All of the 
>> header addresses are normal type somebody at somedomain.com, but the 
>> envelop from address takes the form
>>
>> prvs=somebody=7848db996 at somedomain.com.
>>
>> The recipient is a little mad, because I had the address whitelisted 
>> using the normal type address and it used to work. They want me to 
>> whitelist it again. I guess I could resave my file, but....
>>
>> Is it a proxy, or one of those dang MS products? Any clues?
>>
>> Thanks in advance.
>>
>> Steve Campbell
>>
> Steve,
>
> I think this is something that could track your user if he replied to 
> the email.  Quite harmless.
>
> Denis
>