Unfortunately, these agreements would generally not be enforceable if not signed. And the email that came with the agreements is worded more like a Letter of Intent or Memorandum of Understanding in that the parties were agreeing to general terms but also agreeing to execute a more thorough document at some point.
One possible exception to the above referenced rule is that a court might uphold some of the terms in these documents if it can be shown that one party relied, to their detriment, on these terms, and the other party benefited from the terms. But absent that type of showing, these documents will just be treated as unsigned drafts.
Also, from reading the documents it sounds like Mesh is not even yet a legal entity, or was not at the time the documents were drafted. Is Mesh now a legal entity? If so, the workings of Mesh and the relationship of the parties is simply governed by default California law, as opposed to these unsigned documents. When an LLC or corporation is formed, it is not necessary to have equity agreement, operating agreements, etc. Without any such documents, California law governs. Any documents simply just supersede, or fill in gaps in, the law.
I hope this is helpful, even if its not the answer you wanted to hear. If so, please provide a rating so I receive credit for responding to you. Also, feel free to ask follow up questions. Thanks!