[Zope] Sendmail Error Value: len() of unsized object

[oliver]

hello guys!

i have a question!

i made a sendmail form and all seams to be allright but i get this error:

Error Value: len() of unsized object

Traceback (innermost last):
  File C:\PROGRA~1\zope240\lib\python\ZPublisher\Publish.py, line 223, in
publish_module
  File C:\PROGRA~1\zope240\lib\python\ZPublisher\Publish.py, line 187, in
publish
  File C:\PROGRA~1\zope240\lib\python\Zope\__init__.py, line 226, in
zpublisher_exception_hook
    (Object: LockableItem)
  File C:\PROGRA~1\zope240\lib\python\ZPublisher\Publish.py, line 171, in
publish
  File C:\PROGRA~1\zope240\lib\python\ZPublisher\mapply.py, line 160, in
mapply
    (Object: sendmail)
  File C:\PROGRA~1\zope240\lib\python\ZPublisher\Publish.py, line 112, in
call_object
    (Object: sendmail)
  File C:\PROGRA~1\zope240\lib\python\OFS\DTMLMethod.py, line 194, in
__call__
    (Object: sendmail)
  File C:\PROGRA~1\zope240\lib\python\DocumentTemplate\DT_String.py, line
544, in __call__
    (Object: sendmail)
  File C:\PROGRA~1\zope240\lib\python\Products\MailHost\SendMailTag.py, line
189, in render
    (Object: mail.mopa.at)
  File C:\PROGRA~1\zope240\lib\python\Products\MailHost\MailHost.py, line
231, in send
    (Object: )
  File C:\PROGRA~1\zope240\bin\lib\smtplib.py, line 481, in sendmail
  File C:\PROGRA~1\zope240\bin\lib\smtplib.py, line 363, in mail
  File C:\PROGRA~1\zope240\bin\lib\smtplib.py, line 122, in quoteaddr
  File C:\PROGRA~1\zope240\bin\lib\rfc822.py, line 475, in parseaddr
  File C:\PROGRA~1\zope240\bin\lib\rfc822.py, line 520, in getaddrlist
  File C:\PROGRA~1\zope240\bin\lib\rfc822.py, line 528, in getaddress
  File C:\PROGRA~1\zope240\bin\lib\rfc822.py, line 508, in gotonext
TypeError: (see above)

Thanks in Advance

Oliver