help diagnosing smtp auth problem

I'm running into a problem with Sendmail trying to implement SMTP-
auth. I"m running 8.14.5 and have saslauthd running.

I don't believe I have starttls enabled - just looking for basic auth,
but am wondering if my configuration is not compatible with modern
mail clients? I don't think I have any certs set up.

It seems an older version of Microsoft Outlook Express works fine with
SMTP-auth with no problems, but Outlook 2010 won't work, and neither
will Eudora (basic settings to not use encryption and use same uid/pw
as pop3 account name)

When trying to send mail the server reports: "550 571 Relaying Denied.
Proper authentication required."

Is there some config that I am missing? Why does it work with Outlook
Express but not other e-mail clients?

my site.config.m4 has:

APPENDDEF(`conf_sendmail_LIBS', `-lsasl2')
dnl APPENDDEF(`confLIBDIRS', `-L/usr/local/lib/sasl2')
APPENDDEF(`confLIBDIRS', `-L/usr/local/lib')
APPENDDEF(`confINCDIRS', `-I/usr/local/include')

# telnet localhost 587
Connected to localhost.
Escape character is '^]'.
220 xxxt ESMTP Sendmail 8.14.5/8.14.5; Fri, 15 Jun 2012 18:28:03 -0500
ehlo localhost
250-xxxx Hello localhost [], pleased to meet you
250 HELP

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