This. It's gotten to the point where I don't check email at all because of the constant spam of mails that are not actionable and/or urgent. There are so many different types of automated mails that setting up filters is a never-ending battle. For me, email now serves as an archive/log of everything that has been going on in the company. I search my email to find details about things I am notified about via other channels.
Due to many people doing this, all important notifications that are actually actionable are now sent via Slack as well. So far these notifications are only for things where I actually need to urgently respond or do something, so none of the spam has yet reached Slack.
Also, no one ever seems to personally send an email to another employee because Slack is always the better option, and people actually respond on Slack, unlike via email.
Due to many people doing this, all important notifications that are actually actionable are now sent via Slack as well. So far these notifications are only for things where I actually need to urgently respond or do something, so none of the spam has yet reached Slack.
Also, no one ever seems to personally send an email to another employee because Slack is always the better option, and people actually respond on Slack, unlike via email.