I have installed OnlyOffice from Debian Linux repository.
I can't seem to verify a new user on a portal as I am unable to send a verification mail. Activation mail has been sent, but mails for new user are not. I have Gmail SMTP setup (and working when testing it), and have a custom DNS name. Also, all links generated by Onlyoffice see my local lan domain name for computer, but I would prefer it to use custom DNS name if possible.