+ 2. A "connection_id" variable
+
+ 3. Events smtp:fail:protocol and smtp:fail:syntax
+
+ 4. Support for Exim- and Sieve filters can be omitted at build time
+
+ 5. JSON and LDAP lookup support, both filter types, PAM, RADIUS, perl, SPF,
+ DKIM, DMARC and ARC support, all the router and authenticator drivers,
+ and all the transport drivers except smtp, can now be built as loadable
+ modules
+
+ 6. A transport "socks_proxy" may expand to an empty string, specifying no
+ proxying
+
+ 7. Variables $dmarc_alignment_spf and $dmarc_alignment_dkim
+
+ 8. ATRN provider support
+