Update content/applications/productivity/discuss/advanced/email_servers.rst

Co-authored-by: Timothy Kukulka <91896312+tiku-odoo@users.noreply.github.com>

content/applications/productivity/discuss/advanced/email_servers.rst

@@ -224,6 +224,39 @@ alias in your mail server.
 
 .. _Office 365 documentation:
     https://support.office.com/en-us/article/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-office-365-69f58e99-c550-4274-ad18-c805d654b4c4
+    
+Setting up different outgoing email servers for a multi-company environment
+================================================================
+
+The "From Filter" allows for the use of a specific outgoing email server depending on the "From"
+email address that Odoo is sending on behalf of. When an email is sent from Odoo and the "From
+Filter" is configured, then the email server will be chosen as follows:
+
+#.  Odoo searches for an email server having the same "From Filter" as the "From" email address 
+defined in the outgoing email. For example, if the "From" email address is test@example.com, only
+the email servers having the "From Filter" equal to test@example.com will be returned.
+
+#.  If no email servers are found, then Odoo searches for an email server having the same domain in
+the "From Filter" as in the "From" email address of the outgoing email. For example, if the "From"
+email address is test@example.com, only the email servers having the "From Filter" equal to
+example.com will be returned.
+
+If no email servers are found after checking for the domain, then Odoo will return all email
+servers without any "From Filter" set.
+
+Should this previous query return no results, then Odoo performs a search for an email server
+using the system parameter: 'mail.default.from'. First, the email address listed will attempt
+to match an email server and then the domain will attempt a match.
+
+If no email server is found then Odoo will return the first outgoing email server (sorted by
+priority). In this case, it is likely the email configuration will be spoofing the email and it
+will be flagged as Spam. 
+
+.. note::
+   If several email servers are found, then Odoo will use the first one according to its priority.
+   For example, if there are two email servers, one with a priority of 10 and the other with a
+   priority of 20, then the email server with a priority of 10 will be used.
+
 
 Set up different dedicated servers for transactional and mass mails
 ===================================================================
@@ -250,4 +283,4 @@ server here selected for mass mails.
 Note that in this case, you have to set your domain's Sender Policy Framework (SPF) records to
 include both transactional and mass mail servers. If your server resides with xxxx.odoo.com, the
 available options are Sendinblue and Mailchimp, as your e-mails would be originated from the
-xxxx.odoo.com domain.
+mycompany.odoo.com domain