Corrective releases of the Postfix mail server —
3.5.1, 3.4.11, 3.3.9, and 3.2.14, which to fix DANE/DNSSEC when using the system library , in which backward compatibility in the area of DNSSEC flag transmission was violated. In particular, the transmission of the DNSSEC flag AD (authenticated data) is no longer performed by default, but only when specifying the new flag RES_TRUSTAD in "/etc/resolv.conf" under "_res.options". Without changing the settings, the AD flag set by the DNS server ceased to be passed to applications calling functions like res_search().
Additionally, the new releases have fixed issues with building using the GCC 10 compiler, the release of which is expected in May. Due to changes in GCC that violate backward compatibility, an error ‘multiple definition’ started appearing when attempting to build Postfix.
Source: opennet.ru
