VDS is used only because my ISP does not want to change PTR record for
my static IPv4 address, that is required for outbound SMTP. Also it acts
as a slave DNS server and DNS cache, just to make yet another
round-robin hop for more privacy. All DNS-related traffic goes through
transport IPsec tunnel.

CPU | amd64
RAM | 1GB
HDD | 10 GB
NIC | 1Gbps

=> FreeBSD 13.2 amd64 OS
=> OpenSSH: remote login server, built without OpenSSL
=> NSD: DNS authoritative slave server
=> CurveDNS: DNSCurve server
=> Unbound: recursive cache
=> dqcache: recursive cache with DNSCurve
=> chrony: NTP server
=> Postfix: MTA
=> godlighty: HTTP and CGI server