Mail delivery failed: returning message to sender

[Elan Ruusamäe]

could someone correct this or /dev/null that alias, as the bounce mail 
is sent with each push...


> On 30.12.2020 12:46, Mail Delivery System wrote:
>> This message was created automatically by mail delivery software.
>>
>> A message that you sent could not be delivered to one or more of its
>> recipients. This is a permanent error. The following address(es) failed:
>>
>>    mrozowik at pld-linux.org
>>      host b.mx.pld-linux.org [178.217.190.84]
>>      SMTP error from remote mail server after RCPT 
>> TO:<mrozowik at pld-linux.org>:
>>      550 5.1.1<mrozowik at pld-linux.org>: Recipient address rejected:
>>      User unknown