Is there a trick to setting up Go to send email notifications via SMTP from a Gmail address?

I've set up Mingle to send emails from a Gmail address just fine.

Oddly, when I try setting up Go using the exact same configuration (as far as I can tell), it doesn't work.

Here's what I have:

Hostname: smtp.googlemail.com
Port: 587
Username: [username@domain]
Password: [password]
Use TLS: Yes
From: [email]
Admin mail: [email]

When I click 'Send Test Email' I see the following error appear in red next to the button:

Failed to send test mail because: Failed to send the email. Caused by: Exception reading response

I have also attached the stack trace from the server log.

Stack Trace

2011-07-05 23:34:20,049 ERROR [Thread-44465] CruiseSmtpMailSender:88 - Sending failed for email [Go Email Notification] to [(my email address)]
javax.mail.MessagingException: Exception reading response;
nested exception is:
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1611)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1369)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
at javax.mail.Service.connect(Service.java:288)
at com.thoughtworks.cruise.config.CruiseSmtpMailSender.send(CruiseSmtpMailSender.java:76)
at com.thoughtworks.cruise.config.BackgroundMailSender$1.run(BackgroundMailSender.java:30)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:523)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:789)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1112)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:744)
at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:75)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:88)
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1589)
... 6 more