How do i disable IMAP and POP3 on tenant level?

Not applicable

I was just wondering is there any way to disable them globally rather than disabling for all mailboxes?

2 Replies

Nope, but you can add this as part of your mailbox provisioning scripts.

To add to Vasil's comment, here is the article that discusses this. As you can see at the bottom, they recommend PowerShell.