https://www.postfix.org/announcements/postfix-3.0.2.html
Postfix stable release 3.0.2 and legacy releases 2.11.6, 2.10.8, and 2.9.14
stable release3 0legacy releasespostfix
https://www.postfix.org/announcements/postfix-3.5.5.html
Postfix stable release 3.5.5 and legacy releases 3.4.15, 3.3.13, 3.2.18
stable releaselegacy releasespostfix
https://plasma-mobile.org/info/
Legacy Releases - Plasma Mobile
Note: Plasma Mobile Gear has been discontinued. Applications that were previously part of it are now shipped with KDE Gear, or have independent releases. This...
legacy releasesplasma mobile
https://www.postfix.org/announcements/postfix-3.6.3.html
Postfix stable release 3.6.3 and legacy releases 3.5.13, 3.4.23, 3.3.20
stable releaselegacy releasespostfix
https://canonical.com/blog/canonical-expands-total-coverage-for-ubuntu-lts-releases-to-15-years-with-legacy-add-on
Canonical expands total coverage for Ubuntu LTS releases to 15 years with Legacy add-on
Ubuntu Pro now supports LTS releases for up to 15 years through the Legacy add-on. More security, more stability, and greater control over upgrade timelines...
lts releases15 yearsadd oncanonicalexpands