some sendmail goodies that i have collected, your mileage may vary
just my way of thanking those on this list for their help B)
# prevent people using the EXPN and VRFY commands
# to use tcp-wrappers and hosts.allow / hosts.deny, recompile after
# modifying the makefile in sendmail-8.8.8/src/Makefiles/Makefile.your-os
sendmail: .your.domain EXCEPT spam.net
#remove the version number, obscurity
O SmtpGreetingMessage=$j Mailer ; $b
# header rewriting replacing internal net with your domain-name
# we can also use tables and classes as appropriate
# where $j is your fully-qualified internal machine-name
# and $m is your domain name
R$* < @ $j > $* $@ $1 < @ $m >
Oh and you may want to investigate (lobby for, roll-your-own)
support for authenticated-SMTP and put a stop to mail-spoofing/faking.
Having written a client implementing it and tested it against
Netscape Messaging Server and MS-Exchange it appears we
finally have some solutions in the near future.
wheres my valium ?