The -d8.8 debugging switch causes the resolver
library to be put into debugging mode (if that mode was included when
that library was compiled). The ResolverOptions
option (ResolverOptions) +DEBUG also turns on this
debugging mode. But be aware that turning on +DEBUG will cause a
large number of screens full of output to be produced by the resolver
library for every DNS lookup.
If the name server returns an answer to an MX lookup, and if the
answer is not an MX record or an error, sendmail
will skip that host. The -d8.8 debugging switch
(or the resolver library being in debug mode) then causes
sendmail to print the following:
unexpected answer type wrongtype, size bytes
The wrongtype is an integer that can be found in
<arpa/nameser.h >.
