Website that combines all emails like an iPhone does?

I have a lot of emails. I own several businesses and websites and it is very hard for me to keep up with it all. I understand using just one email would be sufficient, but that's simply just not an option for me. The iPhone is great because I can have all my emails in one. Are there any programs or websites I can use to have all of my emails combined on my computer? I have a MacBook Air.

To do that you would have to upload your email onto the site which would give the owners of the site access to your personal stuff like bank details. My advice - even if you do find one don't use it.
You can just go onto all mail on the MacBook email app or you could get one for it free off the App Store. Just search up something like email manager

ï» complex factor. Look on using a search engine. That will might help.