Redmine

I've inherited an existing Redmine setup, and I'm not entirely familiar with it, so apologies if this is something simple.

I've added a new project, which monitors a particular email address, and creates tickets accordingly. Ticket creation works fine. However, when a ticket is created, no email notification is sent to anyone associated with the project.

There is another project set up already, in which email notifications work properly. I tried to replicate all the settings from that project, but it didn't seem to help.

Environment:
Redmine version 2.2.4.stable
Ruby version 1.9.3 (x86_64-linux)
Rails version 3.2.13
Environment production
Database adapter Mysql2
Redmine plugins:
clipboard_image_paste 1.7
redmine_auto_watch 1.0.0
redmine_auto_watchers 0.3.0
redmine_backlogs v1.0.3
redmine_code_review 0.6.3
redmine_contacts 3.2.17
redmine_contacts_helpdesk 2.2.11
redmine_create_wiki_page 0.1
redmine_custom_workflows 0.0.4
redmine_email_notification_content_filter 0.0.2
redmine_issue_checklist 2.0.5
redmine_mailwrapper 0.1.2
redmine_people 0.1.6
redmine_theme_changer 0.1.0
redmine_wiki_extensions 0.6.4
wiking 0.0.4