Docker image that maps pop3 requests to imap
It is possible to set up the pop3-imap with SSL. For example, the docker-letsencrypt-nginx-proxy-companion offers support for letsencrypt certificates that automatically renew. Follow the instructions on docker-letsencrypt-nginx-proxy-companion on how to set up the nginx container as well as the nginx-proxy-companion.
When the nginx-proxy-companion is set up, run a pop3-imap docker container with the following command (adjust path accordingly).
docker run -dit \
--name pop3-imap-instance \
--restart=always \
-p 995:995 \
-e "VIRTUAL_HOST=pop3-imap.example.com" \
-e "LETSENCRYPT_HOST=pop3-imap.example.com" \
-e "LETSENCRYPT_EMAIL=contact@example.com" \
-e "EF_IMAP_SERVER=imap.another-example.com" \
-e "EF_SSL_KEY=/certs/key.pem" \
-e "EF_SSL_CERT=/certs/fullchain.pem" \
-v /path/to/certs:/certs:ro \
raedle/pop3-imap