+29. In an address list, if the pattern was not a regular expression, an empty
+ subject address (from a bounce message) matched only if the pattern was an
+ empty string. Non-empty patterns were not even tested. This was the wrong
+ because it is perfectly reasonable to use an empty address as part of a
+ database query. An empty address is now tested by patterns that are
+ lookups. However, all the other forms of pattern expect the subject to
+ contain a local part and a domain, and therefore, for them, an empty
+ address still always fails if the pattern is not itself empty.
+
+30. Exim went into a mad DNS loop when attempting to do a callout where the
+ host was specified on an smtp transport, and looking it up yielded more
+ than one IP address.
+