[exim] How to configure exim to run a command on SMTP error …

My application sends emails via exim to members of the site.

Occasionally people move from an organisation and don't update their
email address.

I need to somehow run a command if I get one of these 'bounces' to
update the status of the user in the application.

Can anyone offer any help?

Clive Haworth
amiplaying.com