This is the Mailserver program at host poczta.interia.pl.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the message returned below.
The Mailserver program
<jdorje@xxxxxxxxxxxxxxxxxxxxx>: host
mail.sourceforge.net[66.35.250.206] said:
550-Envelope sender verification failed 550 rejected: there is no
valid
sender in any header line (envelope sender is <bursig@xxxxxxxxx>).
Your
mail server returned: Response from mx.poczta.fm [217.74.65.177]
was "550
<postmaster@xxxxxxxxx>: User unknown" when checking for existence
of a
postmaster mailbox. RFC 822 section 6.3 (which you have to abide
by if you
send and receive Email) states that you are required to have a
postmaster
mailbox that is routed to the person responsible for mail
(http://www.rfc822.com/). We need to be able to contact you at
the
postmaster address to resolve potential problems if need be before
we can
accept your mail. Please create a postmaster account at your site.