I've run into an issue with MailHost returning a "No message recipients designated" exception on an older Zope server that I've never seen before and I can't quite figure out. I created a simple SendMail template that looks similar to: <dtml-sendmail mailhost="testmail"> To: test@test.org From: Test Email <test2@test.org> Subject: Testing Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit <dtml-in "testSQL.Test_SQL_Method(_.None,_)"> <dtml-var testSQLVar missing="" null=""> </dtml-in> </dtml-sendmail> The SQL method will pull a simple string from a table with Latin1 encoding, however, always excepts with "No message recipients designated". If I replace it with just a dash or nothing at all it will send the mail just fine. After researching I believed this had to do with the encoding so I've played around with different values (7bit, none, base64, quoted-printable, etc) and they all send except what I have above. I looked through MailHost.py and was able to change the send function to: def send(self, messageText, mto=None, mfrom=None, subject=None, encode=None, immediate=True): messageText, mto, mfrom = messageText, 'me@test.org','test@test.org' #_mungeHeaders( messageText, mto, mfrom, subject) messageText = _encode(messageText, encode) self._send(mfrom, mto, messageText, immediate) Note the commenting of _mungeHeaders() - this, in turn, sent just fine. I just can't figure out why, out of the blue with no change in the method of how this was created, that this one fails with seemingly fine data. This server is running Zope 2.11.4 (win32) with a MySQL 5.1.40 connected through ZMySQLDA 3.1.1 Any help is appreciated. Thanks, JD