Podman – Pull Images from docker.io
If you want to pull images from Docker Hub with Podman, use one of these two way, depending on, if it is an official image or not.
Official image
For example, PostgreSQL images are official: https://hub.docker.com/_/postgres
podman pull docker.io/library/postgres:latest
Not official image
Dovecot is not official: https://hub.docker.com/r/dovecot/dovecot
podman pull docker.io/dovecot/dovecot:latest