Mail from AOL not longer have X-AOL-Global-Disposition header and this
rule no longer works. AOL messages now have X-YMail-OSG header (like
yahoo.com), but it is encrypted/obfuscated and cannot be used here.
This header is present for most outgoing messages from United Internet which
includes "web.de" and GMX (freemailers which are very popular in Germany) as
well as messages sent from 1and1 webhosting packages.