document via email from libre office
Type “send email” into the search box of this site, read the plenty of answers to the same question and if you can’t find a solution, come back with at least a minimum of technical information and where you failed.
Install the Thunderbird email client, and set it: set your POP3 or IMAP mailbox. The LibreOffice will send the mails through the Thunderbird email client. It works for me from the Menu and by a macro. (You can control the sending by an user defined macro too.)