Thanks for your help so far. Here is the list config:

Default-Options= SUBJECTHDR
Default-Options= NOACK REPRO
Confidential= No
Ack= Yes
Errors-To= <email address here>
Errors-To= <email address here>
Daily-Threshold= 200
Review= Owner
Subscription= Open
Subscription= Confirm
Attachments= no
Language= nohtml
Reply-to= List
Reply-to= Ignore
Notebook= yes
Notebook= d:\list-logs\listname
Notebook= Monthly
Notebook= Private
Send= Private
Filter= Also
Filter= *@emailaddress

Headers to follow....