Mail not relaying in postfix

I am managing a server which mainly deals in relaying mail using virtual alias maps. For some reason unknown to me email that goes through these maps are getting bounced. I've checked to make sure the domains are in my virtual_alias_domains table but they are still bouncing. I've consulted the postfix site but everything seems to be set correctly. How can I diagnose this issue?

Below is information that might be of help:

Aug  2 00:07:01 server2 postfix/smtpd[6729]: NOQUEUE: reject: RCPT from <sender address>: 454 4.7.1 <recipient address>: Relay access denied; from=<sender address> to=<recipient address> proto=ESMTP helo=<sender server>

# postconf -n
alias_database = hash:/usr/local/etc/postfix/aliases
alias_maps = hash:/usr/local/etc/postfix/aliases, hash:/usr/local/etc/postfix/aliases-www
command_directory = /usr/local/sbin
config_directory = /usr/local/etc/postfix
daemon_directory = /usr/local/libexec/postfix
data_directory = /var/db/postfix
debug_peer_level = 2
html_directory = /usr/local/share/doc/postfix
mail_owner = postfix
mailbox_command = /usr/local/bin/procmail
mailbox_size_limit = 524288000
mailq_path = /usr/local/bin/mailq
manpage_directory = /usr/local/man
message_size_limit = 40960000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
myhostname = mymailserver.domain.com
mynetworks = #list of ip's#
myorigin = $mydomain
newaliases_path = /usr/local/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /usr/local/share/doc/postfix
sample_directory = /usr/local/etc/postfix
sendmail_path = /usr/local/sbin/sendmail
setgid_group = maildrop
soft_bounce = yes
unknown_local_recipient_reject_code = 450
virtual_alias_domains = hash:/usr/local/etc/postfix/virtual-alias-domains
virtual_alias_maps = hash:/usr/local/etc/postfix/virtusertable
virtual_mailbox_base = /var/mail
virtual_mailbox_limit = 524288000