Outlook express problem !

[pietrok]

This is the INTERIA.PL program at host smtp.poczta.interia.pl.

I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

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 attached returned message.

Taki zwrotny mail przychodzi do mnie po wyslaniu niektorych maili.Wysylam go
ze skonfigurowanego outlook expressa , wyslany na taki sam adres z innego
konta wysyla bez problemu !