Can't get SMTP to accetp outside email (port 25 not open)

Question

Hi,
I've got the xServer 10.4 (latest) and it appears to be working fine in all other regards.
I have the mail service on (POP and IMAP both work fine) - I can send myself email using the UNIX command line mail (and get it through POP).
But I cannot send email either from my client through the xserver or from another account to the xServer - I'll get the message 'cannot send email for 8 hours...'
A quick port scan shows port 25 is not open (not can I telnet to it). But server admin shows it's running and appears to be happy (it's not over worked anyway).
Any tips would be greatly aprciated.
postconf -n says:
declan:~ frankf$ postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = localhost
localrecipientmaps =
luser_relay = frank
mail_owner = postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
messagesizelimit = 10485760
mydomain = declan.com
mydomain_fallback = localhost
myhostname = home.declan.com
mynetworks = 127.0.0.1/32,192.168.0.1/24
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost = mail.pacbell.net
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpdpw_server_securityoptions = gssapi,cram-md5,plain,login
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpdtls_certfile = /etc/certificates/Default.crt
smtpdtls_keyfile = /etc/certificates/Default.key
smtpduse_pwserver = yes
smtpdusetls = no
unknownlocal_recipient_rejectcode = 550
virtualmailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp

Answer 1

May help if you can answer these questions.
1) Did you set this up with the server admin tools or
have you edited any of the config files?
100% admin tools - this is even a new install. I'm not shy about editing config files but I figured Server Admin was easier and I can't see anything obviously wrong (not that I know that much about it)
2) Did you telent to port 25 using the IP address?
yes, no connection
3) Did you telent to port 25 using the Server Name?
yes, no connection
using port scan of the network utilities shows other ports open, just not 25. Output:
Port Scanning host: 192.168.0.2
Open TCP Port: 22 ssh
Open TCP Port: 53 domain
Open TCP Port: 80 http
Open TCP Port: 110 pop3
Open TCP Port: 143 imap
and so on.
4) What domain do you think you are trying to host
mail?
Well several (I have the viirtural domains turned on) but declan.com will be the main one, right now it's also home.declan.com and donaldgevans.com.
From the information you posted (unless you edited
it) it is not clear how your networks are configured
or what the server is being asked to host. Answers
to the above will help clarify these points as even
if you fix this problem, you may have others.
OK - this is a fixed IP on the internet, going through a firewall (host mapping, everything passed through to this server which is 192.168.0.2). But I think this is less the issue - I can ssh, http, POP, IMAP to this server from either inside or outside the network. I cannot telnet to port 25 by IP or domain name either inside or outside so I assume it's not the network; it's because port 25 is not open.
Frank