[Mailman-Users] Sending domain does not exist but it actually does?

[Jayson Smith]

Hi,


Lately I've been getting some bounced mail from people at the 
provider/server plus.com. I've redacted addresses, but this is the error 
message:


<<< 550 #5.1.8 Domain of sender address <xxxxxxx-bounces at xxxxxxx.com> 
does not exist
554 5.0.0 Service unavailable

Obviously, the sending domain *does* exist, so I assume it's their 
problem. Is there anything at all I can do about this? Not all mail to 
these users bounces.


Thanks,


Jayson