One problem with LTS releases is that down-stream distros can end up running very old code (for example with 4-year LTS up-stream, a down-stream distro with 4-year LTS can end up running 8-year old code, which is really a pain to support on a mailing list like this one). SMTP may be an old protocol but even there, a lot changes in four years.
Since I don't control when a downstream distro's LTS clock starts
ticking, I'll stick with a handful supported stable releases.
Wietse
