We have a zentral post-Admin account which collect different
email-destinations via nicknames (Fax@DNS, Bill@DNS, Sales@DNS, ..).

Now we want to move incoming emails based on the original email-address,
same as the used GW nickname, to different folders. Example is Fax@DNS
should be moved to a folder Fax. We see the nickname in the incomming
mail but we cannot find a working rule.