spamprobe binary package in Ubuntu Focal s390x

 This package provides a spam filter based on the article 'A Plan for Spam'
 by Paul Graham. It uses a database (either BerkeleyDB or a simpler hash
 file) to store one- and two-word phrases. Only certain headers are analyzed
 and HTML tags are ignored to prevent false positives of legitimate HTML
 emails. Image attachments are considered as words that can signal spam. It
 can be simply integrated with procmail or maildrop to filter spam on
 incoming mail.

Source package