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I have a machine I don't want postfix running on and am using sendmail. I modified /etc/mail/sendmail.mc to have this line(hoping it would send mail through that postfix server)...

 define(`SMART_HOST', `postfixhost.yyyy.com')dnl

and ran make to regen the sendmail.cf file and checked it and it looks good. I then sendmail(using the same exact command and same email I use on my relay proxy host which already works good).

I see this error in the /var/log/maillog of my sendmail host

Jan  4 06:59:22 b1 sendmail[20508]: r04DxMkr020508: from=root, size=101, class=0, nrcpts=1, msgid=<201301041359.r04DxMkr020508@sendmailhost.yyyy.com>, relay=root@localhost
Jan  4 06:59:22 b1 sendmail[20508]: r04DxMkr020508: to=dean.hiller@yyyy.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30101, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]

Why is it using 127.0.0.1 to send email still?

Any ideas? thanks, Dean

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    Consider not using sendmail either; instead, install a minimalistic nullclient such as ssmtp or msmtp, and set the smarthost there. You don't run any risk of exposing mail services unintentionally with a nullclient. – adaptr Jan 4 '13 at 14:13
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On you machine there are two sendmail processes running. One is using the submit.cf configuration file and it is the one that tries to hand locally generated mail (like from /bin/mail) to 127.0.0.1. You generally need not bother with submit.{mc,cf}.

Now on 127.0.0.1 there is also another sendmail process running, the one reading the configuration from sendmail.cf. Each time you change sendmail.mc you need to regenerate sendmail.cf and restart sendmail afterwards.

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