The healthcheck is configured to check "localhost:1080", which works iff the web interface is bound to port 1080 and "whatever-localhost-resolves-to".

Unfortunately this breaks for me (Intel mac + podman):

1. The default bind host is 0.0.0.0 (see

   maildev/lib/web.js

   Line 118 in 87eceb0

   host = host || '0.0.0.0'

   )
2. podman sets up the world to support IPv4 and IPv6
3. The maildev container has/receives a /etc/hosts that resolves localhost to both 127.0.0.1 and ::1
4. wget (and/or the underlying libc) has a preference for using IPv6 when it is available:

Log from wget (trimmed a bit to remove podman-compose noise):

$ podman-compose exec maildev wget -O - http://localhost:1080/healthz
Connecting to localhost:1080 ([::1]:1080)
wget: can't connect to remote host: Connection refused
exit code: 1

Workaround

I can set MAILDEV_WEB_IP to ::.

Expectation

"Things work just fine". But, that's not trivial I think:

1. The healthcheck config would need to know what the user configured?
2. IPv4/IPv6 is still quite confusing, and the goal of the project seems to be ease-of-use

So maybe this could be instead added to the documentation?