 smtp; 550 5.1.1 <aza@szs-hranice.cz>: Recipient address
    rejected: undeliverable address: host
    zeus.szs-hranice.cz[/var/run/dovecot/lmtp] said: 550 5.1.1
    <aza@szs-hranice.cz> User doesn't exist: aza@szs-hranice.cz (in reply to
    RCPT TO command)
