[IMP]Misc:SysParm-edits-email-doc

Author: tiku-odoo

content/applications/general/email_communication/email_servers.rst

@@ -271,3 +271,31 @@ By default, inbound messages are fetched every 5 minutes for on-premise database
    This value can be changed in :ref:`developer mode <developer-mode>`. Go to
    :menuselection:`Settings --> Technical --> Automation --> Scheduled Actions` and look for
    :guilabel:`Mail: Fetchmail Service`.
+
+System parameters that prevent loops
+------------------------------------
+
+There are two system parameters that prevent email loops from occurring in Odoo. These parameters
+were introduced in Odoo 16 to prevent aliases from creating too many records and to prevent feedback
+loops on the catchall reply-to email address.
+
+The two system parameters are as follows:
+
+- ``mail.incoming.limit.period`` (60 minutes by default)
+- ``mail.incoming.limit.alias`` (5 by default)
+
+Access these fields in Odoo by navigating to (in :ref:`developer mode <developer-mode>`)
+:menuselection:`Settings --> Technical Menu --> Parameters --> System Parameters`
+
+When an email is received in the Odoo database on the catchall email address or on any alias, Odoo
+looks at the mail received for the given period of time defined in the system parameter
+``mail.incoming.limit.period``. If the received email was sent to an alias then Odoo will reference
+the ``mail.incoming.limit.alias`` system parameter and determine the value as the number of records
+this alias is allowed to create in the give period of time (value of
+``mail.incoming.limit.period``).
+
+In addition when email is received to the catchall email address Odoo will reference the emails
+received to the database during the set period of time (as stated by the value in the system
+parameter: ``mail.incoming.limit.period``). Odoo will then determine whether any of the emails
+received match that of the email being received and prevent a loop from occurring if a duplicate
+email should be present.