[FIX] mail_tracking: reduce spammy score

Fix OCA#701, following idea from https://kb.mailwizz.com/articles/low-score-in-spamassassin-because-of-the-rand_mktg_header-rule/ to avoid matching the regexp explained in https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7888#c5

@Tecnativa TT29674

mail_tracking/__manifest__.py

@@ -7,7 +7,7 @@
 {
     "name": "Email tracking",
     "summary": "Email tracking system for all mails sent",
-    "version": "14.0.1.0.0",
+    "version": "14.0.1.0.1",
     "category": "Social Network",
     "website": "https://github.com/OCA/social",
     "author": ("Tecnativa, " "Odoo Community Association (OCA)"),

mail_tracking/models/ir_mail_server.py

@@ -14,7 +14,7 @@ def _tracking_headers_add(self, tracking_email_id, headers):
         """Allow other addons to add its own tracking SMTP headers"""
         headers = headers or {}
         headers["X-Odoo-Database"] = getattr(threading.currentThread(), "dbname", None)
-        headers["X-Odoo-Tracking-ID"] = tracking_email_id
+        headers["X-Odoo-MailTracking-ID"] = tracking_email_id
         return headers
 
     def _tracking_email_id_body_get(self, body):
@@ -64,9 +64,16 @@ def build_email(
         return msg
 
     def _tracking_email_get(self, message):
-        tracking_email_id = False
-        if message.get("X-Odoo-Tracking-ID", "").isdigit():
-            tracking_email_id = int(message["X-Odoo-Tracking-ID"])
+        try:
+            tracking_email_id = int(
+                message.get(
+                    "X-Odoo-MailTracking-ID",
+                    # Deprecated tracking header, kept as fallback
+                    message["X-Odoo-Tracking-ID"],
+                )
+            )
+        except (TypeError, ValueError, KeyError):
+            tracking_email_id = False
         return self.env["mail.tracking.email"].browse(tracking_email_id)
 
     def _smtp_server_get(self, mail_server_id, smtp_server):