Working in LibreOffice, you can send the current document as an email attachment.
In case you want to send the email to a recipient who only has software that cannot read the OpenDocument format, you can send the current document in an often used proprietary format.
For a text document, choose File - Send - Email as Microsoft Word . For a spreadsheet, choose File - Send - Email as Microsoft Excel . And for a presentation, choose File - Send - Email as Microsoft PowerPoint .
If you want to send the document as a read-only file, choose File - Send - Email as PDF .
These commands do not change your current document. Only a temporary copy is created and sent.