Rails - Dec 2007 - Mail_Queue Plugin working in Development, but not Production

I''ve got the Mail-Queue plugin working for development, and it was
recently (2 weeks ago) working in Production mode, too.  But now it''s
not.

This is what happens if I run "ruby script/runner MailQueue.process -e
production" on the production server:

/usr/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/runner.rb:47:
/usr/lib/ruby/1.8/net/smtp.rb:680:in `check_response'': 501 <>:
missing
or malformed local part (Net::SMTPSyntaxError)
        from /usr/lib/ruby/1.8/net/smtp.rb:653:in `getok''
        from /usr/lib/ruby/1.8/net/smtp.rb:635:in `rcptto''
        from /usr/lib/ruby/1.8/net/smtp.rb:546:in `send0''
        from /usr/lib/ruby/1.8/net/smtp.rb:545:in `send0''
        from /usr/lib/ruby/1.8/net/smtp.rb:472:in `sendmail''
        from
/usr/lib/ruby/gems/1.8/gems/actionmailer-1.3.3/lib/action_mailer/base.rb:567:in
`perform_delivery_smtp''
        from /usr/lib/ruby/1.8/net/smtp.rb:379:in `start''

Has anyone advice on this matter?

Concerned,
Joe
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I''ve got the same ActionMailer::Base.smtp_settings in both production 
and development environments, yet mail-queue only works in development. 
Anybody know why?

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Mail-queue is catching all the emails and storing them, but seems unable 
to send them.
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