Mail rule to modify e-mail header (via external command line tool)

Question

Hello,
Apple Mail lets me add AppleScripts which will be executed whenever this rule is being called.
I have some command line tools that lets me add some information to the e-mail's header. For example, spamprobe (a anti spam tool, which works perfectly for me) would add an e-mail header like
X-SpamProbe: SPAM 0.9999749 8aba943058c55bb20bd974fc534b71cc
or clamdscan would add (in combination with the command line tool formail) add information about viruses into the e-mail header, such as
X-Virus: [clamscan] Heuristics.Phishing.Email.SpoofedDomain FOUND
After marking the e-mails, spam can be easily filtered out. Currently I'm using procmail to call all those external tools. They work much more accurate for me than Apple Mail's built-in spamfilter.
Now, however, I want to keep my mail on an IMAP server, thus, procmail does not work anymore. (procmail works only on local e-mails.) Is there any way to "stamp" incoming mails with Apple Mail by an external command line tool, leaving the mail at the end on the IMAP server? It should be the following workflow:
Apple Mail checks new mails and calls a rule on any e-mail which sends a copy of the mail to an external command line tool
The command line tool adds information to the given e-mail (e.g., virus or spam information)
Apple Mail "replaces" the e-mail on the IMAP server with the altered e-mail
Apple Mail calls another rule which filters all detected spam e-mails
Is Mail + AppleScript that flexible to include the use of external command line tools?
Certainly, an even better alternative would be to have a tool like procmail which could work directly on messages on IMAP servers. However, I'm not aware of any that could do that.
Thanks for any comment.
Claus

Answer 1

If you want to execute a command line as a mail rule you could define an apple script that executes the command line,
for example
tell application "Finder"
  do shell script "ls"
end tell
executes the shell command "ls"
For "ls" substitute your command line command.