Not sure about vpopmail. To be honest it must be some time ago as I can't remember off hand what you are talking about, so probably I'm not able to give you an answer in the first place.
As for the webmail package, great idea! You might want to integrate it with the mail-tracking package so we have a folder for send items that refers to the mailtracking package or alternatively have mailtracking use your IMAP folder instead.
This would be especially great if we could interface it with any IMAP server, so we could get rid of the need to forward an external mail to the mail-tracking package so we can access this mails information in the project.
Here is the szenario (for our CRM/Project Management installations):
Client sends an order via e-mail. A project is created in OpenACS and during the creation of the project an IMAP folder is created to be able to store the e-mail. Then the user moves the e-mail using Outlook to the imap folder. The mail-tracking system is able to find that e-mail in the folder and displays it in a mail-tracking portlet. Once you click on the link for the e-mail, the webmail package will open and display the e-mail from the imap folder.
We could probably get our client to fund the integrational part if the rest (decent webmail system, good installation instructions) are in place already.
