Currently my sendmail sends mail using the default route.
i have multiple interfaces and want to force sendmail to use one that isn't the default route.

is there a way for me to force sendmail to use a different interface then the default route?

Thanks

by route you mean interface e.g. IP address?

there is a section in your /etc/mail/sendmail.mc file that you can uncomment,edit then 'm4'

dnl # orig: DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')

or edit your /etc/mail/sendmail.cf on this line

O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA


HTH

default route meaning if a program doesn't specify the NIC/interface/IP to use to send packets then it will default to a certain one.

I have already done the changes you mentioned above, they only apply to what IP sendmail will LISTEN to not SEND on

you probably want to edit the default route in the routing table...

Read about the route command which can change your routing table. On boot I usually just set the default route w/ a script.

This prints your routing table.

#> route

As you have multiple NICs I assume that for some reason you want ONLY SMTP (outgoing mail) to use a route other than the default (other outgoing connections to services (ports) use the default) ??

If so, you obviously cannot change your route with as suggested by others. I never ran across this exact problem before so even dug out my sendmail book and looked there -- no configuration directive for sendmail.mc (at least that I could find). So, I would look at setting up iptables to route only outgoing port 25 (SMTP) out on a specific interface. That's the only thing I can think of right now that may solve what I think you say is your problem.

ok the IPtables is better than changing the default route, i will do that.
thank you all for responding