exim4 smarthost and SBC Yahoo
 

I am running Sarge/exim4 and have spent all day trying to figure out why I keep getting the authenticaion required message when I try to send a message out to the SBC/Yahoo SMTP server. Here are my configuration files I can't seem to find anything that disagrees with how the SMARTHOST function is supposed to work. Thanks in adavance:

# /etc/exim4/update-exim4.conf.conf
#
# Edit this file and /etc/mailname by hand and execute update-exim4.conf
# yourself or use 'dpkg-reconfigure exim4-config'

dc_eximconfig_configtype='smarthost'
dc_other_hostnames='localhost.localdomain'
dc_local_interfaces='127.0.0.1'
dc_readhost=''
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.sbcglobal.yahoo.com'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='false'
dc_mailname_in_oh='true'

### CONFDIR/passwd.client
#
# Format:
#targetmailserver.example:login:password
smtp.sbcglobal.yahoo.com:myyahooid:myyahoopassword
#
# default entry:
### *:bar:foo

Well I found the root cause. SBC/Yahoo's SMTP server does not allow relaying of mail messages that the domain name doesn't match the mail account. I used the same configuration but using dyndns.org's mail relay service and it works like a champ....

Also SBC/Yahoo blocks the default port for SMTP to all other hosts on the Internet except for their SMTP server....

-RonV