Returgods

Hej Ekspert.
Jeg har et problem med at sende mail's til min datter. Hver gang jeg sender noget til hende for jeg denne besked:

This is the Postfix program at host pfepa.post.tele.dk.

I'm sorry to have to inform you that your message could not
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.

The Postfix program

<merian@fiberbolig.dk>: host mail.em1.dk[217.198.208.12] said: 554 5.7.1
    Message cannot be accepted, BW filter rejection (in reply to end of DATA
    command)

Jeg er temlig træt af at få det samme returgods.

Jeg bruger Windows Vista med tilhørende mailprogram.