@uxintro The point for those emails is to inform you that a new hashtag is not showing up in your "Trending Now" section because you haven't approved that hashtag before.
You can disable the "Trending Now" feature in Preferences->Administration->Site Settings under "Trending Hashtags" or if you want to leave it on, you can disable those specific emails in Preferences->Notifications.
@mastohost Very helpful, thanks.
@uxintro Just wanted to let you know that on v3.0.1 you have an admin setting to auto-approve trending hashtags https://github.com/tootsuite/mastodon/releases/tag/v3.0.1
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