Man pages matching name mailstats in section 8:

mailstats.8.ja	debian 10 / manpages-ja
mailstats.8.zh_CN	debian 10 / manpages-zh
mailstats.8.zh_TW	debian 10 / manpages-zh
mailstats.8.en	debian 10 / sendmail-bin
mailstats.8.ja	debian 11 / manpages-ja
mailstats.8.zh_CN	debian 11 / manpages-zh
mailstats.8.zh_TW	debian 11 / manpages-zh
mailstats.8.en	debian 11 / sendmail-bin
mailstats.8.ja	debian 12 / manpages-ja
mailstats.8.zh_CN	debian 12 / manpages-zh
mailstats.8.zh_TW	debian 12 / manpages-zh
mailstats.8.en	debian 12 / sendmail-bin