<peterz@infradead.org>: host casper.infradead.org[85.118.1.10] said:
    550-Verification failed for <compudj@mail.openrapids.net> 550-Called:
    64.15.138.104 550-Sent:     RCPT TO:<compudj@mail.openrapids.net>
    550-Response: 550 5.1.1 <compudj@mail.openrapids.net>: Recipient address
    rejected: User unknown in local recipient table 550 Sender verify failed
    (in reply to RCPT TO command)

<tglx@linutronix.de>: host mail.linutronix.de[62.245.132.108] said:
    550-Verification failed for <compudj@mail.openrapids.net> 550-Called:
    64.15.138.104 550-Sent:     RCPT TO:<compudj@mail.openrapids.net>
    550-Response: 550 5.1.1 <compudj@mail.openrapids.net>: Recipient address
    rejected: User unknown in local recipient table 550 Sender verify failed
    (in reply to RCPT TO command)