Time to update Zawinski’s law: any productivity SaaS grows until they release their own branded mail client.
There’s barely any point in setting up your own provider now because you have to compete both with free. All the action has been around email clients which have typically been acquired and then crushed.
Google could have stuck with the protocol or presented a spec for it, rather than leaving the competition with IMAP and SMTP.
What makes sense is they dominated the market and helped put up roadblocks afterwards. EEE.
I have gmail for ages now and i do not switch over to iphone/apple or microsoft. I do wait for google to provide AI features on Gmail and GDrive.
If your central live tool is notion, i would want to have my emails in it too.