Can't send mail with Server 10.4.8

Yes... I'm very new at this.
I've got 10.4.8 server set up as a mail server, with SMTP enabled. I think I have DNS configured properly, but I can't send email. I can recieve email. If I run mail (ie, the command "mail") from the terminal, I can send any user email, and they can retrieve that email using the Mac mail app. However, when I try to use the mail app to send, I get the error "cannot send message using the server dns.cha.com". I'm sure I'm doing something very obviously wrong. Following is a dump of postconf -n. Any help out there?
Thanks,
Eric
dns:~ esmith$ postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = $myhostname,localhost.$mydomain,localhost
mydomain = cha.com
mydomain_fallback = localhost
myhostname = dns.cha.com
mynetworks = 127.0.0.1/32,dns.cha.com,10.0.1.7,10.0.1.4
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpdpw_server_securityoptions = none
smtpdrecipientrestrictions = permitmynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = no
smtpdtls_certfile = /etc/certificates/Default.crt
smtpdtls_keyfile = /etc/certificates/Default.key
smtpduse_pwserver = no
smtpdusetls = no
unknownlocal_recipient_rejectcode = 550

Thanks for the info. Unfortunately, I still have the same trouble sending mail: it works from the command line, but not from the mail application. The mail error is "cannot send message using server xxx.xxx.xxx", which is the same message that would be sent even if I entered a bogus mail server address. I use the same machine name for the SMTP server and POP server. When I watch the connections pane, I see my computer making a POP connection to get mail, so the DNS must be OK.
Here's the config again... thanks for any help you can offer!
dns:~ esmith$ postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = $myhostname,localhost.$mydomain,localhost
mydomain = cha.com
mydomain_fallback = localhost
myhostname = dns.cha.com
mynetworks = 127.0.0.1/32,10.0.1.0/24
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpdpw_server_securityoptions = none
smtpdrecipientrestrictions = permitmynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = no
smtpdtls_certfile = /etc/certificates/Default.crt
smtpdtls_keyfile = /etc/certificates/Default.key
smtpduse_pwserver = no
smtpdusetls = no
unknownlocal_recipient_rejectcode = 550

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