The relay connection only had `secure`, so with `secure: false` nodemailer
still upgraded to STARTTLS whenever the server advertised it, and there was
no way to talk cleartext to such a server. Pass nodemailer's `ignoreTLS`
through as `ignoreTLS` on the relay config, wired to
--outgoing-ignore-tls / MAILDEV_OUTGOING_IGNORE_TLS / `outgoingIgnoreTls`.
MAILDEV_HTTPS is listed in BOOLEAN_VARS, but envVarToConfigKey() had no
entry for `https`, so the boolean pass skipped it and the raw string from
ENV_MAPPING stayed in the config. MAILDEV_HTTPS=false then enabled HTTPS
and validation demanded httpsCert and httpsKey.
dualfroz
upstream