Whitelist Narkasa email in your email server. Add below emails into your whitelist/safe sender for:
Log in to Outlook on web browser.
Note-tipTurn off the beta version.
Settings > View All Outlook settings > Mail >Junk email > Safe senders and domains Click "Add" and put in one email address, press Enter button and add the following email addresses one by one to the list and make sure to click "Save" button after you finish adding them.
You can click more information about Outlook.
Log in to your Google Mail on web browser.
Settings > Filters and Blocked Addresses > Create a new filter Add the email address listed below (one by one) in the “From” field. Check the box “Never send it to spam” and then create the filter.
You can click more information about Gmail.