Dovecot: setup METADATA

There is no dictionary to set additional attributes,
but admin email can already be retrieved:

? GETMETADATA "" (/shared/admin)
* METADATA "" (/shared/admin {27}
mailto:root@c20.testrun.org)
? OK Getmetadata completed (0.001 + 0.000 secs).

cmdeploy/src/cmdeploy/dovecot/dovecot.conf.j2

@@ -13,13 +13,15 @@ auth_cache_size = 100M
 mail_debug = yes
 {% endif %}
 
+mail_server_admin = mailto:root@{{ config.mail_domain }}
+mail_server_comment = Chatmail server
 
 mail_plugins = quota
 
 # these are the capabilities Delta Chat cares about actually 
 # so let's keep the network overhead per login small
 # https://github.com/deltachat/deltachat-core-rust/blob/master/src/imap/capabilities.rs
-imap_capability = IMAP4rev1 IDLE MOVE QUOTA CONDSTORE NOTIFY
+imap_capability = IMAP4rev1 IDLE MOVE QUOTA CONDSTORE NOTIFY METADATA
 
 
 # Authentication for system users.
@@ -73,6 +75,7 @@ mail_privileged_group = vmail
 # <https://datatracker.ietf.org/doc/html/rfc4978.html>
 protocol imap {
   mail_plugins = $mail_plugins imap_zlib imap_quota
+  imap_metadata = yes
 }
 
 protocol lmtp {

cmdeploy/src/cmdeploy/nginx/nginx.conf.j2

@@ -58,19 +58,8 @@ http {
 		}
 
 		# Old URL for compatibility with e.g. printed QR codes.
-		#
-		# Copy-paste instead of redirect to /new
-		# because Delta Chat core does not follow redirects.
-		#
-		# Redirects are only for browsers.
 		location /cgi-bin/newemail.py {
-			if ($request_method = GET) {
-				return 301 dcaccount:https://{{ config.domain_name }}/new;
-			}
-
-			fastcgi_pass unix:/run/fcgiwrap.socket;
-			include /etc/nginx/fastcgi_params;
-			fastcgi_param SCRIPT_FILENAME /usr/lib/cgi-bin/newemail.py;
+			return 301 /new;
 		}
 	}