Can't receive email form outside accounts

Hi everyone,
I am trying to set up a mail server on [nuke dot mgh dot harvard dot edu].
I can send emails anywhere, I can receive email from the accounts created on this server, but I can't receive anything from any outside account. I know there are other threads with a similar problem, but fixes described there didn't help so far. Any help will be appreciated.
the postifx config is:
nuke:~ MP$ postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter =
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
localrecipientmaps = proxy:unix:passwd.byname $alias_maps
luser_relay =
mail_owner = postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
messagesizelimit = 52428800
mydestination = $myhostname,localhost.$mydomain,localhost,nuke.mgh.harvard.edu
mydomain_fallback = localhost
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 = plain,login,cram-md5
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpdtls_keyfile =
smtpduse_pwserver = yes
unknownlocal_recipient_rejectcode = 550
virtualmailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp

Do the following tests:
1. From the server itself, open a Terminal window and issue:
telnet localhost 25
If you see your mail server responding, your are fine locally. (enter quit to exit).
2. From a client machine in the same subnet as the server issue:
telnet serverip 25
If the mail server responds you know it's not the firewall on the server. If it doesn't then it's probably the OS X firewall.
3. If needed, keep going "further" away and repeat above procedure until you know where port 25 is shut.
Nuke is a subdomain, but what is an MX record? (if "what" is too long to explain, is there a simple instruction somewhere on how to create it?)
An MX record is a DNS entry that tells the outside world, which server is responsible for handling mail for the domain/subdomain in question.
If leaving the name untouched in the config was the only ingenious thing I've done today, I could call it a great day
No to worry. Obfuscating domain names is pretty pointless anyway as they are public.

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