If found this TypeError description in many places in the mailing list archive, but no solution to my sendmail problem. Code: <dtml-sendmail mailhost="MailHost"> To: <<dtml-var email>> From: <<dtml-var webmaster_email>> Subject: Registration at <dtml-var sitetitle> <dtml-var attached_email> </dtml-sendmail> If I do this...: dtml-sendmail mailhost="MailHost" To: <<dtml-var email>> From: <<dtml-var webmaster_email>> Subject: Registration at <dtml-var sitetitle> <dtml-var attached_email> /dtml-sendmail ... it doesn't return any errors and looks fine. Traceback (innermost last): File C:\Program\ZopeSite\lib\python\ZPublisher\Publish.py, line 222, in publish_module File C:\Program\ZopeSite\lib\python\ZPublisher\Publish.py, line 187, in publish File C:\Program\ZopeSite\lib\python\Zope\__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File C:\Program\ZopeSite\lib\python\ZPublisher\Publish.py, line 171, in publish File C:\Program\ZopeSite\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: index_html) File C:\Program\ZopeSite\lib\python\ZPublisher\Publish.py, line 112, in call_object (Object: index_html) File C:\Program\ZopeSite\lib\python\OFS\DTMLMethod.py, line 172, in __call__ (Object: index_html) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_String.py, line 528, in __call__ (Object: index_html) File C:\Program\ZopeSite\lib\python\OFS\DTMLMethod.py, line 168, in __call__ (Object: manage_html) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_String.py, line 528, in __call__ (Object: manage_html) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_With.py, line 146, in render (Object: PARENTS[0]) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_With.py, line 146, in render (Object: dochtml) File C:\Program\ZopeSite\lib\python\OFS\DTMLMethod.py, line 168, in __call__ (Object: signup_dtml) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_String.py, line 528, in __call__ (Object: signup_dtml) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_With.py, line 146, in render (Object: members) File C:\Program\ZopeSite\lib\python\DocumentTemplate\DT_Let.py, line 147, in render (Object: madepassword="members.makepassword_pym(6)") File C:\Program\ZopeSite\lib\python\Products\MailHost\SendMailTag.py, line 188, in render (Object: MailHost) File C:\Program\ZopeSite\lib\python\Products\MailHost\MailHost.py, line 220, in send (Object: MailHost) File C:\Program\ZopeSite/bin/lib\smtplib.py, line 465, in sendmail File C:\Program\ZopeSite/bin/lib\smtplib.py, line 349, in mail File C:\Program\ZopeSite/bin/lib\smtplib.py, line 118, in quoteaddr File C:\Program\ZopeSite/bin/lib\rfc822.py, line 451, in parseaddr File C:\Program\ZopeSite/bin/lib\rfc822.py, line 496, in getaddrlist File C:\Program\ZopeSite/bin/lib\rfc822.py, line 504, in getaddress File C:\Program\ZopeSite/bin/lib\rfc822.py, line 484, in gotonext TypeError: (see above)