Notifications senr to me when a new comment is posted, keep landing in my spambox, no matter what.
Unfortunately there is nothing we can do if it lands on the spam because it actually depends on your mail server. But I would suggest that using a transactional mail service e.g.
https://sendgrid.com/
It might be some of the possibilities why your e-mails lead into spam folder.
1. Your domain has been somehow blacklisted.
2. You are using PHP Mailer to send e-mails which most email providers consider as unreliable.
3. Your email server's IP address has been marked as spam.
Services like
https://sendgrid.com/ provides email delivery services and allows you to setup SMTP authentication in your Joomla global configuration. Most of the time, e-mails delivered by these transactional e-mails would lead into the inbox.
In the event that the emails are also flagged as spam, you could get in touch with their support to look into this
Is it possible to set a different email address for Komento? Changing the admin mail address for the whole site would be too radical.
Unfortunately that is not possible to set it, unless you setup your different site admin under different Joomla user group, so you can able to configure only particular Joomla user group receive those new comment email notification. (screenshot :
http://take.ms/sz6xy)