File naming conventions when sending file back and forth via email? I often edit a manuscript draft with co-authors by sending drafts of a document back and forth via email. Depending on who I am working with, cloud-based solutions to working collaboratively are not always an option. 

After some back and forth a lot of interim drafts begin floating around, so a lot of my co-authors either initial, date, or number a working document when we send it back and forth for edits. Some do none of this at all. I am wondering if there is a correct way to "name" a document when collaborating via email. Is there a consensus on best practices for file-naming conventions when collaboratively editing via email?
Not using version control is bad.


  Depending on who I am working with, cloud-based[, version controlled] solutions to working collaboratively are not always an option.


You can use cloud-based solutions even when some collaborators are against them. All you need to do is: Download and email the cloud version to collaborators that refuse to use the cloud, and upload whatever they send back.