fix(mail): modify the message-id to not start by <XX- that trigger a native spamassassin rule

https://github.com/apache/spamassassin/blob/ed9239e5d1f3d3607207e7557e81a41e18d24988/rulesrc/sandbox/felicity/70_other.cf#L267

SoObjects/SOGo/SOGoObject.m

@@ -102,6 +102,8 @@
       pid = getpid();
       rndm = random();
     }
+  if(pid<255)
+    pid+=255; //Because of a native spamassassin rule -> header TVD_RATWARE_MSGID_01 rule on message-id like '<XX-' are suspicious.(Message-ID =~ /<[a-z0-9]{2}-/)
   sequence++;
   f = [[NSDate date] timeIntervalSince1970];