Email relay not really working like it used to in Snow Leopard

We used to have our Snow Leopard server do email relaying to our ISP for internal servers.
e.g. if our SL server was 192.168.0.1, it was set to relay all email from 192.168.0.x to relay.isp.com.
That way, if another server on 192.168.0.2 (let's call it server2) wanted to send email, we'd have the smtp server set to 192.168.0.1
This worked beautifully.
We recently upgraded to Mavericks server and now it's rejecting emails left and right.
Setup: our Mavericks server has a DNS name of mavericks.domain.com
This DNS name *only* existed on our internal network. All the internal computers are using an internal DNS server.
So e.g. server2 will send email from [email protected] to xyz. It worked before because the "from" was [email protected] instead of [email protected]
FWIW, domain.com email is hosted by Google, and [email protected] is a valid user address.
This is what shows in the log when server2 tries to send email:
Jun 21 10:14:03 mavericks.domain.com postfix/smtpd[12346]: connect from server2.domain.com[192.168.0.2]
Jun 21 10:14:03 mavericks.domain.com postfix/smtpd[12346]: NOQUEUE: reject: RCPT from server2.domain.com[192.168.0.2]: 554 5.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<phitter>
Jun 21 10:14:03 mavericks.domain.com postfix/smtpd[12346]: disconnect from server2.domain.com[192.168.0.2]
Jun 21 10:14:18 mavericks.domain.com postfix/smtpd[12339]: lost connection after EHLO from server2.domain.com[192.168.0.2]
Jun 21 10:14:18 mavericks.domain.com postfix/smtpd[12343]: lost connection after EHLO from server2.domain.com[192.168.0.2]
Jun 21 10:14:18 mavericks.domain.com postfix/smtpd[12339]: disconnect from server2.domain.com[192.168.0.2]
Jun 21 10:14:18 mavericks.domain.com postfix/smtpd[12343]: disconnect from server2.domain.com[192.168.0.2]
So is *Mavericks* denying the relay or is our ISP's smtp server denying it? And what else can I do to troubleshoot/fix this?

Thanks Linc. Here're the results:
biff = no
command_directory = /usr/sbin
config_directory = /Library/Server/Mail/Config/postfix
content_filter =
daemon_directory = /usr/libexec/postfix
data_directory = /Library/Server/Mail/Data/mta
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin xxgdb $daemon_directory/$process_name $process_id & sleep 5
dovecot_destination_recipient_limit = 1
enable_server_options = yes
header_checks =
html_directory = /usr/share/doc/postfix/html
imap_submit_cred_file = /Library/Server/Mail/Config/postfix/submit.cred
inet_interfaces = all
inet_protocols = all
mail_owner = _postfix
mailbox_size_limit = 0
mailbox_transport = dovecot
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
message_size_limit = 10485760
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = mavericks.domain.com
mydomain_fallback = localhost
myhostname = mavericks.domain.com
mynetworks = 127.0.0.0/8, [::1]/128
newaliases_path = /usr/bin/newaliases
queue_directory = /Library/Server/Mail/Data/spool
readme_directory = /usr/share/doc/postfix
recipient_canonical_maps = hash:/Library/Server/Mail/Config/postfix/system_user_maps
recipient_delimiter = +
relayhost = relay.isp.com
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtp_sasl_auth_enable = no
smtp_sasl_password_maps =
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated permit
smtpd_enforce_tls = no
smtpd_helo_required = no
smtpd_helo_restrictions =
smtpd_pw_server_security_options = cram-md5,digest-md5,gssapi,login,plain
smtpd_recipient_restrictions = permit_sasl_authenticated permit_mynetworks reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_tls_CAfile = /etc/certificates/mavericks.domain.com.E0C73F9F0CD1927144F1096791F4903D636EEBDD .chain.pem
smtpd_tls_cert_file = /etc/certificates/mavericks.domain.com.E0C73F9F0CD1927144F1096791F4903D636EEBDD .cert.pem
smtpd_tls_ciphers = medium
smtpd_tls_exclude_ciphers = SSLv2, aNULL, ADH, eNULL
smtpd_tls_key_file = /etc/certificates/mavericks.domain.com.E0C73F9F0CD1927144F1096791F4903D636EEBDD .key.pem
smtpd_use_pw_server = yes
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
use_sacl_cache = yes
virtual_alias_domains = $virtual_alias_maps
virtual_alias_maps = $virtual_maps

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