Man pages matching name sendmail::pmilter in section 3pm:

Sendmail::PMilter.3pm.en	debian 10 / libsendmail-pmilter-perl
Sendmail::PMilter.3pm.en	debian 11 / libsendmail-pmilter-perl
Sendmail::PMilter.3pm.en	debian 12 / libsendmail-pmilter-perl