Currently it is possible to configure the notifications whether they should be sent as batch or directly. 

This reduces the amount of mails already, but still there is a huge amount of mails in my mailbox. It would be nice, if I could configure, for which triggers I want to receive an E-Mail at all. My personal workflow would be, to only activate mail notifications for comments where I am explicitly mentioned. All other triggers like comments, pushes, approvals etc. can be omitted. 

There could be a configuration for every of the actions on this page: https://confluence.atlassian.com/bitbucketserver/pull-request-notifications-949754837.html

or maybe only for a subset.