Q: How to ... Generic names for mail users

["Andreas P." <nospam@xxxxxxxxxx>]

Dear all,

I hope you all have had a happy and healthy start in 2005 and all my 
best wishes to anyone here for the new year.
I have the following setup: postfix is the mail gateway towards and from 
the internet and a mailssystem runs behind it to deal with the end 
users. So far no problems to send/receive mail to the individual users.
Now I'd like to introduce a "generic name" for some of my mailusers:
  Real user:    some.one@xxxxxx
  Generic name: some.one-[xxx]@my.dom
The generic name consists of
  - the local part of real name
  - plus a dash (at least this would be my favourite)
  - plus a variable part [xxx] of any length.

So far I haven't found a way to get this done. The name extensions I 
have found with using "some.one+xxx@xxxxxx" are not accepted by the 
mailsystem behind.
Thanks in advance.
Best regards

Andreas