I am responsible for maintaining a couple of small business' email server.
I currently use FreeBSD, Sendmail, Procmail, and Spamassassin. (Apache as the web-server along with Squirrelmail.)
While writing a procmail recipe is easy for me, the average end-user is never going to be able to ssh into the mail-server and edit their own procmail.rc file.
I would like to add a feature that adds to the bottom of their emails some sort of 'footer' that will be appended to their messages for them to click on a link and perhaps say; "Add This Sender To Whitelist" or "Block This Sender" - and then update their procmail recipe.
Any suggestions on how to accomplish this?
$permit_list="email1|email
Rather than having a recipe for each email address.
Is there a single mail server or do you have multiple mail servers with the mailbox storage on NFS mounts?
Squirelmail configuration is using pop or does it run with SUID as the user that logs in and accesses the mail directly (Maildir format of messages)?