I'm have postfix + dovecot + MySQL setup on my Mac w/ Snow Leopard (64 bit) and used your tutorial to get me going. Though everything works it only runs for a short time before I can't connect to send mail and I see this error:

[code]Jan 20 15:19:30 mail postfix/master[88432]: fatal: bind 0.0.0.0 port 25: Address already in use[/code]

[b]sudo lsof -i :25[/b]
[code]COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
smtp 89048 _postfix 10u IPv4 0x208bf710 0t0 TCP mail.pounce.com:56970->ip91.98.69.80.in-addr.arpa:smtp (ESTABLISHED)
smtpd 89065 _postfix 6u IPv4 0x208c5740 0t0 TCP *:smtp (LISTEN)
smtpd 89065 _postfix 11u IPv4 0x208c5b4c 0t0 TCP mail.pounce.com:smtp->s69-163-43-237.in-addr.arpa.static.dsn1.net:31182 (ESTABLISHED)
[/code]

Which looks right, but perhaps the issue is that there is no master process. I don't know... ???

[b]sudo postconf -n[/b]
[code]
biff = no
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
disable_vrfy_command = yes
html_directory = /usr/share/doc/postfix/html
mail_owner = _postfix
mailbox_size_limit = 0
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
message_size_limit = 10485760
myhostname = mail.domain.com
myorigin = $myhostname
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtp_tls_security_level = none
smtpd_client_event_limit_exceptions = $mynetworks
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated permit
smtpd_data_restrictions = reject_unauth_pipelining
smtpd_etrn_restrictions = reject
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_non_fqdn_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unauth_destination, reject_unauth_pipelining, reject_invalid_hostname, reject_rbl_client zen.spamhaus.org, permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_tls_cert_file = /etc/ssl/mail.domain.com.crt
smtpd_tls_exclude_ciphers = SSLv2, aNULL, ADH, eNULL
smtpd_tls_key_file = /etc/ssl/mail.domain.com.key
smtpd_tls_loglevel = 1
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/conf/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:199
virtual_mailbox_base = /Volumes/data/mail/
virtual_mailbox_domains = mysql:/etc/postfix/conf/mysql_virtual_domains_maps.cf
virtual_mailbox_limit = 51200000
virtual_mailbox_maps = mysql:/etc/postfix/conf/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 199
virtual_transport = dovecot
virtual_uid_maps = static:199
[/code]

I'm new to postfix so I'm not very proficient in troubleshooting so any help would be greatly appreciated.

Thanks.

[hmm...]

Your config looks a bit different then mine, please check your config file against the settings put into the documentation. If your absolutely sure it's orect check the master.cf as well.