Man pages matching name mail::server::imap4::fetch in section 3pm:

Mail::Server::IMAP4::Fetch.3pm.en	debian 10 / libmail-box-imap4-perl
Mail::Server::IMAP4::Fetch.3pm.en	debian 11 / libmail-box-imap4-perl
Mail::Server::IMAP4::Fetch.3pm.en	debian 12 / libmail-box-imap4-perl