Man pages matching name formail in section 1:

formail.1.es	debian 10 / manpages-es-extra
formail.1.pl	debian 10 / manpages-pl
formail.1.en	debian 10 / procmail
formail.1.pl	debian 11 / manpages-pl
formail.1.en	debian 11 / procmail
formail.1.pl	debian 12 / manpages-pl
formail.1.en	debian 12 / procmail