curl --url "imaps://://example.com*" \
     --user "user@example.com:password"

curl --url "imaps://://example.com" \
     --user "user@example.com:password"

Fetch only the Text Body
curl --url "imaps://://example.com" \
     --user "user@example.com:password"

Alternative first check the message count using a custom command:

curl --url "imaps://imap.example.com" -X "STATUS INBOX (MESSAGES)" --user "user:pass"