Good afternoon everyone,
what I suggest today is to use the Alias hostname for the links used into the emails sent by Qlik Sense SaaS.
From what I've seen today, the two links at the bottom of the alert's emails (Customize your Qlik notifications and unsubscribe from <alert name>) are actually using the hostname of the tenant.
I'm not sure about mail digest's emails or any other email sent by Qlik Sense SaaS, but I would suggest to use in all configurations the Alias hostname.
Let me know what you think,