Redmine

I have configured the email notification with sendmail (that relays to our main mail server with SMART_HOST)

When I use the test email button it is able to send to my email (single recipient), but when I update a bug there are 10 users that are notified and this is what I see in my /var/mail/mail.log:

Dec 24 09:35:42 redmine sendmail[10606]: rBOEZLVH010606: from=root@domain.ca, size=3123, class=0, nrcpts=2, msgid=<redmine.journal-997.20131224143521.e6ffa7b43c7d12bb@domain.ca>, relay=www-data@localhost

Dec 24 09:36:02 redmine sm-mta[10616]: rBOEZgjK010616: from=<root@domain.ca>, size=3365, class=0, nrcpts=2, msgid=<redmine.journal-997.20131224143521.e6ffa7b43c7d12bb@domain.ca>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]

Dec 24 09:36:02 redmine sendmail[10606]: rBOEZLVH010606: to=user1@domain.ca,user2@domain.ca, ctladdr=root@domain.ca (33/33), delay=00:00:41, xdelay=00:00:20, mailer=relay, pri=63123, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (rBOEZgjK010616 Message accepted for delivery)

Dec 24 09:36:37 redmine sm-mta[10627]: rBOEZgjK010616: to=<user2@domain.ca>,<user1@domain.ca>, delay=00:00:35, xdelay=00:00:35, mailer=relay, pri=153365, relay=facteur.domain.ca. [204.41.x.x], dsn=2.0.0, stat=Sent (Ok: queued as 876162078D9)

The people on the list do receive the email, but there should be more than 2 recipients

Environment:
Redmine version 2.4.2.stable.12452
Ruby version 1.9.3-p484 (2013-11-22) [i686-linux]
Rails version 3.2.16
Environment production
Database adapter PostgreSQL
SCM:
Subversion 1.6.17
Git 1.7.10.4
Filesystem
Redmine plugins:
no plugin installed
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