Redmine

I've searched for this for quite a while, but I could not find someone else who already asked this question. Apologies if I missed it.

We've installed Redmine at my work and people have started using it extensively (big success - kudos to all you developers). One 'problem' that they are asking about is how to remove the original issue from being included in the email that is sent out when the issue is updated? Often the original issue is quite big, and the updates are small.

Any ideas?

Thank you in advance.