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To extract a unique list of e-mail addresses from your 'Sent' folder (in mbox format), you could use something like this:

In your ~/.spamassassin/user_prefs file, put this in:

include sent_whitelist

The following script will create the sent_whitelist file with 100 addresses per line:

 #!/bin/sh

SADIR=~/.spamassassin
SENTMAIL=~/mail/Sent

rmcat -f $SADIR/sent_whitelist
for x in `grep "^To:" $SENTMAIL $SENTMAIL |
        grep -Ei '^(To|cc|bcc):' |
	grep grep -EiooEi '[-a-z0-9_.+_=/-]+@([-a-z0-9-]+\.]+)+[a-z]{2,}' |
	tr "A-Z" "a-z" |
	sort -u`u ;

	do|
        xargs -n 100 echo "whitelist_from $x" >>> $SADIR/sent_whitelist
done

cat $SADIR/user_prefs.base $SADIR/sent_whitelist > $SADIR/user_prefs

This can be adapted as necessary, and executed as a cron job. Note, this requires you to store/rename your user_prefs file to user_prefs.base! Make sure you do this before running the script or you'll lose your preferences. Of course if there is some way I'm not aware of to include files from within a user_prefs file, please someone make the necessary changes.

_(There is a way: include filename - Include configuration lines from "filename". Relative paths are considered relative to the current configuration file or user preferences file.)

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The script is simple and fast, but not very accurate. It extracts strings looking like e-mail addresses from the lines starting with To: CC: and BCC. However it does not take into account the continuation lines (addresses on continuation lines are not added to the white list), but extracts addresses from message body (if a line in the body starts with To:/CC:/BCC:, which often happens when formwarding e-mails).

To make the script more accurate but much more slow replace the line "grep -Ei '^(To|cc|bcc):'|" with a call to formail (part of procmail package):

	formail -s formail -czx 'To:' -x 'CC:' -x 'BCC:' |

Building an auto-whitelist from LDAP

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