Attachment Links in the Email is not Accessible

**Summary**

Links to attachments in the email notifications are incorrect.

**Steps to reproduce**

1. Create request in Service Desk.
2. Upload the attachment and mention the attachment in the comment by using this command; [^file_name.file_format]
3. The email will send to the customer email. And customer click to the attachment link that contained in the email.

**Sample Link**

Attachment link from email: http://secure/attachment/10100/<attachment_name>
Attachment link from Customer Portal: https://<instance name>/secure/attachment/10100/<attachment_name>