What causes this type of address in envelopes?

[Nick Phillips]

On 2/10/2007, at 8:35 AM, Steve Campbell wrote:

> Wow, that's some thick reading.
>
> So, if this is what they are using, then a simple "reply" to one  
> sent to one of my users should work, unless the sender has their  
> expiry timeout way too short? It seems that whenever someone tries  
> to reply to the original sender, on occasion, the message is not  
> accepted due to an invalid user return.
> (I could be wrong on the memory part of that statement - they may  
> be trying to send to the "real" email address of the sender, not  
> that prvs thingy).
>
> I guess you can send to the real address if it's not a reply? Are  
> these setups sometimes misconfigured?

If you have a non-empty envelope sender, you should be OK. It should  
only be bounces that have empty envelope senders.


Cheers,


Nick