Dear Experts,

I have installed postfix which has public ip address 174.x.x.x and I want to use that smtp to send email from 124.109.34.3 but I can't. I can send emails locally using this smtp but cannot even telnet from
this IP 124.109.34.3.

# nmap 174.x.x.x doesn't show that 25 port is open but
#namp localhost shows that 25 port is opened.

I have disabled selinux and firewall. my configuration files are below.

My main.cf is

# grep -v ^# /etc/postfix/main.cf | grep -v ^$
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
myhostname = mailserv.domainname.com
mydomain = domainname.com
inet_interfaces = all
inet_interfaces = $myhostname
inet_interfaces = $myhostname, localhost
mydestination = $myhostname, localhost.$mydomain, localhost
unknown_local_recipient_reject_code = 550
mynetworks = 10.0.0.0/8, 127.0.0.0/8, 124.109.34.3/32
relay_domains=
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
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
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES

and master.cf


# grep -v ^# /etc/postfix/master.cf | grep -v ^$
smtp inet n - n - - smtpd -v
pickup fifo n - n 60 1 pickup
cleanup unix n - n - 0 cleanup
qmgr fifo n - n 300 1 qmgr
tlsmgr unix - - n 1000? 1 tlsmgr
rewrite unix - - n - - trivial-rewrite
bounce unix - - n - 0 bounce
defer unix - - n - 0 bounce
trace unix - - n - 0 bounce
verify unix - - n - 1 verify
flush unix n - n 1000? 0 flush
proxymap unix - - n - - proxymap
smtp unix - - n - - smtp
relay unix - - n - - smtp
-o fallback_relay=
showq unix n - n - - showq
error unix - - n - - error
discard unix - - n - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - n - - lmtp
anvil unix - - n - 1 anvil
scache unix - - n - 1 scache
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
old-cyrus unix - n n - - pipe
flags=R user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -m ${extension} ${user}
cyrus unix - n n - - pipe
user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -r ${sender} -m ${extension} ${user}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient

Hi

It looks like you have inet_interfaces many times in the config file. And then only the last one is used. I would try to remove them all, since the default value is "all".

If the server has many networks, and it should only listen to some of them, you have need to specify which it should listen on. Here is some info:

http://www.postfix.org/postconf.5.html

noaw my main.cf but still same problem

# grep -v ^# /etc/postfix/main.cf | grep -v ^$
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
myhostname = mailserv.domainname.com
mydomain = domainname.com
inet_interfaces = all
unknown_local_recipient_reject_code = 550
mynetworks = 10.0.0.0/8, 127.0.0.0/8, 124.109.34.3/32
relay_domains=
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
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
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES

So your public IP is 172.x.x.x.
Is postfix installed on the machine that has the public IP, or are you behind a router with NAT?

Might help as well:

http://www.linuxquestions.org/questi...ywhere-335981/

Too much guesswork.
will show you where postfix is listening.
Then you'll know if you have to look at postfix config or at your firewall.

the public ip starts from 174...no firewall running at the moment

My guess is that you are behind NAT..