[IMP] base: insert dummy SMTP server

The current neutralization implementation for ir_mail_server deactivates
existing servers. This can still result in mails being sent if an SMTP
server was specified on the command-line. To prevent that from happening
a dummy SMTP server is defined that doesn't resolve to anything.

I've opted to use the "invalid" domain for this purpose:
https://www.rfc-editor.org/rfc/rfc6761#section-6.4 .

closes odoo/odoo#131138

X-original-commit: 4ceed406ead570b00e6e8973e55866bee4c84de8
Signed-off-by: Merel Geens <mege@odoo.com>

odoo/addons/base/data/neutralize.sql

@@ -2,6 +2,10 @@
 UPDATE ir_mail_server
    SET active = false;
 
+-- insert dummy mail server to prevent using fallback servers specified using command line
+INSERT INTO ir_mail_server(name, smtp_port, smtp_host, smtp_encryption, active, smtp_authentication)
+VALUES ('neutralization - disable emails', 1025, 'invalid', 'none', true, 'login');
+
 -- deactivate crons
 UPDATE ir_cron
    SET active = false