signed messages & mutt

[Davide Cavallari]

thanks a lot for all these informations!
there is a mutt config variable I don't understand yet:

set pgp_sign_micalg=<some>
   # message integrity check algorithm, where
   # <some> is something from the next: 

	        pgp-md5  	            to RSA keys 
	        pgp-sha1                    to DSS (DSA) keys 
		pgp-rmd160

What is this MIC algorithm? Is it something different from the digest used
to sign  the message?  (the default  in my gpg  is using  SHA1 to  get the
message digest)
-- 
Cheers,
    Davide Cavallari
"Lei che mestiere fa?"
"L'autobussiere."
		-- Adriano Celentano, "Innamorato pazzo"