The original message was received at Fri, 5 Mar 2021 00:33:11 +0100 from 168-181-129-144.caetenet.com.br [168.181.129.144] ----- The following addresses had permanent fatal errors ----- <c13faf77f@veteranbil.dk> (reason: 550 5.1.1 <info@veteranbilklub.dk>: Recipient address rejected: User unknown in virtual mailbox table) ----- Transcript of session follows ----- ... while talking to ispc4.dotserv.com.:

...

...

DATA <<< 550 5.1.1 <info@veteranbilklub.dk>: Recipient address rejected: User unknown in virtual mailbox table 550 5.1.1 <c13faf77f@veteranbil.dk>... User unknown <<< 554 5.5.1 Error: no valid recipients