Fixing mail format to RFC 822

Hello,
 I have a simple question. How can I fix mailbox format from some unknown
to RFC 822 style? Even better, how can I determine in which mail format is
it?

The file is at http://www.natur.cuni.cz/~mmokrejs/krb4.txt

/bin/Mail -f krb4.txt cannot read it.


I'd like to point to emil package at:

ftp://ftp.uu.se/pub/unix/networking/mail/emil

I thought about using metamail
from ftp://ftp.funet.fi/pub/unix/mail/metamail


I'm simply stuck. Thank you for responding.
Martin