[Mailman-Users] how to auto-allow messages from any address?

[lp]

Is there any way for mailman to except mail from any address, or how do 
I define a regular expression that equals "any email address" under 
Sender Filters>List of non-member addresses whose postings should be 
automatically accepted.

I don't understand jack shit about regular expressions in python, so 
please give an example.

Thanx,
Luka