Man pages matching name qpsmtpd::connection in section 3pm:

Qpsmtpd::Connection.3pm.en	debian 10 / qpsmtpd
Qpsmtpd::Connection.3pm.en	debian 11 / qpsmtpd
Qpsmtpd::Connection.3pm.en	debian 12 / qpsmtpd