I'd normally attribute this problem to DNS, but I can't track down
what DNS problem is occuring. Note the lag between the first event
and the next. Any suggestions?
Sendmail attempts to do a "getpeername()" and an identd lookup
of the sending process for logging purposes. You can turn this
off. For a persistant connection, the second thing that gets
sent down it avoids this check.
Do you know what the switch is for turning that off?
It depends on the version of sendmail. If it's not 8.12.5, you
will need a local hack; for that, you should look for where
the variable "RealHostName" is set in the C sources in
If it's newer, then there should be an option for your m4 file
in sendmail/cf/README (NOT in the book!).
You might also want to play with confTO_IDENT (the 5 second
ident timer) and confTO_RESOLVER_RETRY (the resolver timeout).
If you need the local hack, it's pretty rivial, I can walk
you through it.
Alternately, you could get the remote side to answer the phone.
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