certificate issuing for mail list users

[David Southwell]

Hi

Before starting to build it  I am wondering if anyone knows of a port that 
will do what I require. I am reluctant (and too lazy <chuckles>) to want to 
reinvent the wheel!!!

I want to issue  my maillist users (using mailman) with a certificate, signed 
by us, that they will be asked  to use to certify their identity when posting 
to the list. I want them to apply for the certificate using the the maillist 
web site and the records kept in  a mysql database. Ideally I would like to 
incorporate certificate checking as part of the process of validating mails 
for posting to a list. 

For some lists, where we have a means of being able to be sure of user 
identity and a security need,  I want to reject uncertified mails. In other 
cases I simply want to add a warning in the first line of the Body when the 
mail is uncertified.

Thanks in advance
david