Instead of inviting teammates one by one, you can also configure your settings so anyone in your Slack team with email addresses at specified domains can join your workspace automatically.
E.g. I am working at Kipwise and I can allow everyone using a @kipwise.com email for their Slack account to join our Kipwise workspace automatically as long as they have the link to our Kipwise workspace.
To do this,
1. Click on the more button (the three dots) at the top right corner on the navigation menu
2. Select Teammates from the drop down menu
3. Under Allowed email domains, enter the email domain that you would like to whitelist
4. Then you just need to share the URL of your Kipwise web portal or the link to any of you Kipwise Pages, and teammates with email addresses under these allowed email domains can join your Kipwise workspace automatically as Member (see how to set user role) without needing your approval.