[Zope] problems using sendmail-tag

[Philipp Dunkel]

Hi everybody.

I have a form that calls a sendmail tag to send user-feedback to a specific
email-adress.
When I try to send mail I always get the error:

Recieved error code 553 from SMTP: 553 ... Domain name required 

I know that this error occurs if the user is not allowed to send mail from
that host.
The strange thing is that my zope runs under user 'zope'.
But if I telnet to port 25 (sendmail) as user 'zope' I can send mail??

Any Ideas?

TIA
Philipp Dunkel
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