how do I by-pass the signature check?

["Russell L. Harris" <rlharris hal-pc org>]

Help!  I find it EXTREMELY irritating that Balsa by default checks the  
signature, and brings up a dialogue box whenever the signature cannot  
be verified due to a missing key.  I care not whether a signature can  
be verified---I simply wish the freedom to scan and delete messages  
without having to disrupt the routine because someone has signed a  
message and I do not have his key.  How may I cause Balsa to bypass  
this check?  If the check cannot be by-passed, I shall abandon the use  
of Balsa --- it is too fatiguing.

Example of the message in the dialogue box:

"Checking the signature of the message sent by Albrecht Dreß <albrecht. 
dress arcor de> with subject "Re: 2.1.3 Discussion Points" returned:
The signature could not be verified due to a missing key."

RLH