Compatibility with UpdraftPlus

Hi,

I see the emails sent by UpdraftPlus end up in the spam folder, whereas emails from other plugins get to the inbox.

The problem url in the email notification looks like this:

Backup of: http://tracking.domain.com/tracking/click?d=wsXCNCbYLFhivVhKX9jcizLkx9RRkjjFbnb9GjZ9fP0vrPJyb4Gqqq7tIl81gjT7G9uKNZpz_goIeTFZLZAdnOW1RrFwLyibr-alphanumericstringcontd-xxxxxxyyyy
UpdraftPlus WordPress backup is complete

Any suggestions to fix this problem witnessed on multiple websites. Can it happen when on a free plan of Elastic Email or other reasons?

Kind regards,