Overview
This is the first "release" on GitHub, as opposed to signed tags. We're now using GitHub Actions to automatically invoke goreleaser for tags, and building artifacts for various target platforms.
Version 0.5 introduced -proxy-tcp, to be able to use a SOCKS5 proxy for establishing the outbound SMTP connections and so bypassing various SMTP port filters or limited IPv6 connectivity, while still using local DNS resolvers.
Version 0.4.4 is the first release which correctly stopped trying various DNS resolvers once an answer had been found, and so should be a small stability improvement in the presence of imperfect DNS resolvers.