Hallo,
was bedeutet denn diese Meldung?
<snip>
<alter at test.de>: host MAILGATE.XXX.de[xxx.xxx.xxx.xxx]
    said: 550-connection forbidden: sender_verify 550 rejected: there is no
    valid sender in any header line (envelope sender is
    <www-data at server1.art-domains.de>) (in reply to end of DATA command)
</snip>
cu Jim