I'm recreated a mailhost in Zope 2.2.0. Whenever I want to send mail with sendmail tag I get a TypeError. This worked in Zope 2.1.x. This is the traceback: Traceback (innermost last): File /usr/local/zope/2-2-0/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/zope/2-2-0/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/zope/2-2-0/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: RoleManager) File /usr/local/zope/2-2-0/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/zope/2-2-0/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_editProperties) File /usr/local/zope/2-2-0/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: manage_editProperties) File /usr/local/zope/2-2-0/lib/python/Products/Etailer/OrderManager.py, line 136, in manage_editProperties (Object: RoleManager) File /usr/local/zope/2-2-0/lib/python/App/special_dtml.py, line 120, in __call__ (Object: testemail) File /usr/local/zope/2-2-0/lib/python/DocumentTemplate/DT_String.py, line 528, in __call__ (Object: testemail) File /usr/local/zope/2-2-0/lib/python/Products/MailHost/SendMailTag.py, line 188, in render (Object: MailHost) File /usr/local/zope/2-2-0/lib/python/Products/MailHost/MailHost.py, line 220, in send (Object: MailHost) File /var/tmp/python/python-root/usr/lib/python1.5/smtplib.py, line 465, in sendmail File /var/tmp/python/python-root/usr/lib/python1.5/smtplib.py, line 349, in mail File /var/tmp/python/python-root/usr/lib/python1.5/smtplib.py, line 118, in quoteaddr File /var/tmp/python/python-root/usr/lib/python1.5/rfc822.py, line 451, in parseaddr File /var/tmp/python/python-root/usr/lib/python1.5/rfc822.py, line 496, in getaddrlist File /var/tmp/python/python-root/usr/lib/python1.5/rfc822.py, line 504, in getaddress File /var/tmp/python/python-root/usr/lib/python1.5/rfc822.py, line 484, in gotonext TypeError: len() of unsized object --> The source for my DTML method: <dtml-if orderemail> <dtml-sendmail mailhost="MailHost"> To: <<dtml-var orderemail>> From: <<dtml-var orderemail>> Subject: Test email from <dtml-var shopName> Hi, This is a test email from your online shop. If you have received this email, then you will also receive an email for each of the orders that are placed at your online store. </dtml-sendmail> </dtml-if>