Man pages matching name msmtp in section 1:

msmtp.1.zh_CN	debian 10 / manpages-zh
msmtp.1.zh_TW	debian 10 / manpages-zh
msmtp.1.en	debian 10 / msmtp
msmtp.1.zh_CN	debian 11 / manpages-zh
msmtp.1.zh_TW	debian 11 / manpages-zh
msmtp.1.en	debian 11 / msmtp
msmtp.1.zh_CN	debian 12 / manpages-zh
msmtp.1.zh_TW	debian 12 / manpages-zh
msmtp.1.en	debian 12 / msmtp