> Is there a way to have sendmail use a specific IP/Interface to send mail
> that is "From:" a certain address? (Can you point me to a doc?)
I can't point you to a doc for it, but doing that specifically would
probably require multiple instances of sendmail with distinct queues and
cf files.
What problem are you actually trying to solve? Is it something that
might be solvable by a simpler approach like assigning suitable DNS PTR
records (i.e. perhaps even the perfectly legitimate step of multiple PTR
records for an IP?)
--
Now where did I hide that website...
Reading the code suggests that sendmail references the macros
{daemon_flags} {if_addr}
in the makeconnection() routine.
I suggest you try to have those macros set to desirable values from
your rulesets.
I have no reason to think this will actually work, so let us know if it
does.