Most author publishing agreements allow stipulate this. In my experience, the author retains copyright, but grants a license to distribute the typeset, proofrea

Most author publishing agreements allow stipulate this. In my experience, the author retains copyright, but grants a license to distribute the typeset, proofread document. You generally have the right to distribute an un-typeset copy on your own website, and on platforms (arXiv), sometimes after an embargo period (6 months to 2 years). I think personal communication attachments are not really considered distribution, so I have not seen the published/preprint version stipulated either way.