Redmine

I found on my local MTA:
Feb 26 15:00:57 jones postfix/smtpd¹³⁵²⁷: warning: Illegal address syntax from localhost[127.0.0.1] in RCPT command: <>
This is due to the user updating an issue but with mail preferences set to not mail himself for its own changes. As there is nobody watching the issue, the recipient list is empty.

In 'app/models/mailer.rb' create_mail(), super is called even if there is nothing to mail, causing this error. Perhaps something like :
super unless recipients.empty? and (not cc or cc.empty?) and (not bcc or bcc.empty?)
would do, but i'm not sure the Bcc-recipients feature would not cause the same SMTP error too (perhaps setting recipients = from would solve the issue in this case).