Troubleshooting Tip: In FortiGate VMs PAYG licenses default SMTP server from Fortinet stops working after upgrading to v7.4.4

Users have the default SMTP server in the FortiGate Configuration

config system email-server
    set server "fortinet-notifications.com"
    set port 465
    set security smtps
end

After upgrading to v7.4.4 the SMTP default server stops working due to the modifications included and explained in Technical Tip: Default email server changes and unable to send alert email due to no valid support.

In the GUI, users start seeing the following message: 'The default server is only available for registered devices with a valid entitlement'.

Solution:

Upgrade to v7.4.5 or v7.6.0.

Note:

After upgrading FortiGate to the recommended versions, users may continue seeing the warning notification in the GUI. 

However, in CLI, users can verify that the mails are correctly sent:

from:fortinet-notifications.com user:DoNotReply@fortinet-notifications.com
mail_info:
reverse path:DoNotReply@fortinet-notifications.com
user name:DoNotReply
=== send len: 489
session: 0x563194ae9770, rsp_state: data2, code: 250
session: 0x563194ae9770, rsp_state: quit, code: 221
session finined
_session_on_destroy
<== send mail success, m = 0x563194b19cc0 s = 0x563194ae9770

The GUI Issue is currently under internal investigation.

This has been documented in Default email server available to registered devices with FortiCare - FortiOS v7.4.4 release notes.