+37. The dnsdb lookup has been extended in a number of ways.
+
+ (1) There is a new type, "zns", which walks up the domain tree until it
+ finds some nameserver records. It should be used with care.
+
+ (2) There is a new type, "mxh", which is like "mx" except that it returns
+ just the host names, not the priorities.
+
+ (3) It is now possible to give a list of domains (or IP addresses) to be
+ looked up.
+
+ (4) It is now possible to specify the separator character for use when
+ multiple records are returned.
+
+38. The dnslists ACL condition has been extended: it is now possible to supply
+ a list of IP addresses and/or domains to be looked up in a particular DNS
+ domain.
+
+39. Added log_selector=+queue_time_overall.
+
+40. When running the queue in the test harness, wait just a tad after forking a
+ delivery process, to get repeatability of debugging output.
+
+41. Include certificate and key file names in error message when GnuTLS fails
+ to set them up, because the GnuTLS error message doesn't include the name
+ of the failing file when there is a problem reading it.
+
+42. Allow both -bf and -bF in the same test run.
+
+43. Did the same fix as 41 above for OpenSSL, which had the same infelicity.
+
+44. The "Exiscan patch" is now merged into the mainline Exim source.
+
+45. Sometimes the final signoff response after QUIT could fail to get
+ transmitted in the non-TLS case. Testing !tls_active instead of tls_active
+ < 0 before doing a fflush(). This bug looks as though it goes back to the
+ introduction of TLS in release 3.20, but "sometimes" must have been rare
+ because the tests only now provoked it.
+
+46. Reset the locale to "C" after calling embedded Perl, in case it was changed
+ (this can affect the format of dates).