Man pages matching name mail::spamassassin::plugin::askdns in section 3pm:

Mail::SpamAssassin::Plugin::AskDNS.3pm.en	debian 10 / spamassassin
Mail::SpamAssassin::Plugin::AskDNS.3pm.en	debian 11 / spamassassin
Mail::SpamAssassin::Plugin::AskDNS.3pm.en	debian 12 / spamassassin