name submit server closer to its real name

This really tells me our naming convention sucks and we should have
picked example0 instead of example-01... But anyway.

policy/tpa-rfc-44-email-emergency-recovery/architecture-pre.dot

@@ -11,7 +11,7 @@ digraph email {
         tpoboxes [label="other TPA hosts"]
         // hosts that manage and send their own email
         mailhosts [label="mail hosts\ngitlab, RT, CiviCRM"]
-        submission
+        submit1
         // legacy
         eugeni [style=filled label="eugeni\nmailman, schleuder\nmx, MTA"]
         // external boxes
@@ -23,13 +23,13 @@ digraph email {
 
         // eugeni handles basically everything except some rare
         // exceptions on mailhosts
-        {submission, dotdotdot} -> { mailhosts, eugeni }
+        {submit1, dotdotdot} -> { mailhosts, eugeni }
         // users interact with those
-        user -> submission
+        user -> submit1
         user -> eugeni [label="HTTP\nSMTP"]
         user -> mailhosts [label="HTTP"]
         // those all relay mail to the outside
-        { submission, mailhosts } -> dotdotdot
+        { submit1, mailhosts } -> dotdotdot
         eugeni -> dotdotdot [color=orange label="unreliable"]
         // except those, who still go through the relay
         tpoboxes -> eugeni [label="SMTPS"]