Re: Exim4 tuning on Debian squeeze
for a home server, I inserted the following into /etc/exim4/exim4.conf.template
# Disable the ident callbacks defined by RFC 1413
rfc1413_query_timeout = 0s
# Avoid a reverse lookup of the client host name
which, of course, has some security drawbacks. Take a look into
/usr/share/doc/exim4-base/spec.txt.gz for explanation. Also, the key words in
the comments should help to find some documentation.
Don't forget to run update-exim4.conf after editing /etc/exim4/exim4.conf.template .