As Tim says.
But, all email, whether Gmail, Microsoft, etc, is handled by an ISP (an internet provider. You do not have any details of where you live, etc, but this could be your local telephone provider.
Do a search for their site and log in. This login you should have on record, or, possibly, on your bills. In any case, a quick communication will give you the details.
On their site, will be the Email section , which will, at least temporarily, have all your email stored, for your examination.