The best alternatives to Alert.email are PigeonBot, and SharedInbox. If these 2 options don't work for you, we've listed a few more alternatives below.
What do you think of Alert.email?
AssemblyAI— Speech-to-Text API with superhuman accuracy
SharedInbox for your Teams within Slack - Connect your existing team email (like help@, info@, sales@) to Slack, collaborate over external emails effortlessly!