letsession: JmapSession=serde_json::from_str(&res_text).map_err(|_|MeliError::new(format!("Could not connect to JMAP server endpoint for {}. Is your server hostname setting correct? (i.e. \"jmap.mailserver.org\") (Note: only session resource discovery via /.well-known/jmap is supported. DNS SRV records are not suppported.)",&server_conf.server_hostname)))?;