When configuring Redmine project management to send email notifications, using Exim MTA, you might end up with test emails bouncing due to no recipients specified. It’s a bit tricky to debug, but, fortunately, quite easy to fix. The problem comes from different implementations of “-t” option handling for /usr/sbin/sendmail. Redmine uses this option to specify on the command line to specify message recipients However, Exim by default uses a different behavior, where it gets recipients from the message headers, and removes from that list recipients which are provided using the “-t” command line option.
The solution to the problem is a very simple – just add the following line to your /etc/exim/exim.conf file, as per this FAQ:
extract_addresses_remove_arguments = false