SMTPRecipientsRefused: {<email address hidden>': (550, 'relay not permitted')} error when sending queued letters

[Antti Moilanen]

I'm using Plone 3.3.5 with collective.dancing 0.9.2 and I get following error when sending queued messages:
SMTPRecipientsRefused: {<email address hidden>': (550, 'relay not permitted')}

After some investigation I noticed I didn't have this problem with collective.dancing 0.9.0 and SMTPMailer seems to have following change between these versions:

0.9.2:
return dict(hostname=m.smtp_host or 'localhost',
                 port=m.smtp_port, username=m.smtp_uid or None,
                 password=m.smtp_pwd or None,)

0.9.0:
        return dict(hostname=m.smtp_host or 'localhost',
                    port=m.smtp_port,
                    username=m.smtp_userid or m.smtp_uid or None,
                    password=m.smtp_pass or m.smtp_pwd or None,)

I'm not sure why this change has been made, but m.smtp_userid and m.smtp_pass seems to actually have correct username and password and therefore working, but m.smtp_uid and m.smtp_pwd are just empty strings.

Regards,
Antti Moilanen