Man pages matching name mailq in section 8:

mailq.8.en	debian 10 / dma
mailq.8.en	debian 10 / exim4-daemon-heavy
mailq.8.en	debian 10 / exim4-daemon-light
mailq.8.en	debian 11 / dma
mailq.8.en	debian 11 / exim4-daemon-heavy
mailq.8.en	debian 11 / exim4-daemon-light
mailq.8.en	debian 11 / ssmtp
mailq.8.en	debian 12 / dma
mailq.8.en	debian 12 / exim4-daemon-heavy
mailq.8.en	debian 12 / exim4-daemon-light
mailq.8.en	debian 12 / ssmtp