Там пара CVE исправлена. https://www.cvedetails.com/vulnerability-list/vendor_id-6485/Dovecot.html
dovecot-2.2.36-alt0.M80P.1 -> p8: Fri Jul 20 2018 Andrey Bychkov <mrdrew@altlinux> 2.2.36-alt0.M80P.1 - Backport new version to p8 branch (closes #35142) - (Fixes: CVE-2017-15130, CVE-2017-14461, CVE-2017-15132) Fri Jul 20 2018 Andrey Bychkov <mrdrew@altlinux> 2.2.36-alt1 - Update version to 2.2.36 from src