I use WordPress on one of my sites with WPForms, for emails, which has the features I described earlier.
Synology is pretty good at supporting their packages but wish you luck at getting them to help with anything else. I get a server 504 error when uploading really large files to the MariaDB database. I asked Synology for help, but none of their answers resolved the problem. Manually altering NGINX works until the next Synology upgrade, which over-writes any changes I make.
So I really do like my Synology NAS but get frustrated at times when looking for answers. Needless to say I've had to study a lot to get everything working on my sites.