Redmine

I installed Redmine 2.5 on my local server. I am using smtp for email on that server and the application is sending email to all addresses successfully with one exception.

We have a Sympa email server in which we can create and manage email lists. When I attempt to send an email to one of these lists email addresses it gets blocked. After talking to my corporate help desk and analyzing the emails generated by Redmine we figured out that the blocking is because our Sympa server is configured to reject any email which has 'Auto-Submitted' => 'auto-generated' in the header. This configuration in Sympa is locked in so I need to work around this. I commented out this line in app/models/mailer.rb and now it successfully sends emails to our lists.

I guess this raises a couple questions.
Firstly, was commenting out this line the correct way to handle this problem or is there a configuration file that I should add a rule to?
Secondly, I apologize for my lack of knowledge, but is this tag necessary on the overall scheme of things? Does Redmine need to add this to all emails or could this be deleted in future versions of redmine?

Thank you for any feedback!!

OS: RHEL 5.9 & RHEL 6.4
Environment:
Redmine version 2.5.0.devel
Ruby version 1.9.2-p290 (2011-07-09) [x86_64-linux]
Rails version 3.2.17
Environment production
Database adapter Mysql2
SCM:
Subversion 1.6.11
Mercurial 1.3.1
Git 1.7.11.4
Filesystem
Redmine plugins:
event_notifications 2.0.0
projects_tree_view 0.0.8
redmine_assets_plugin 0.0.1
redmine_banner 0.0.9
redmine_ckeditor 1.0.16
redmine_didyoumean 1.2.0
redmine_graphs 0.1.0
redmine_holidays_plugin 0.0.1
redmine_image_clipboard_paste 1.0.0
redmine_issue_favicon 0.0.1
redmine_issue_monitoring 0.0.1
redmine_monitoring_controlling 0.1.1