Server can't "see" the internet

Hi folks!

Probably this may be a common error, caused by a little mistake of myself during the installation process. Please let me know what's going wrong.
This problem is similar as what i found on this thread: http://www.howtoforge.com/forums/showthread.php?t=125&highlight=relay

When i try to send a mail via Uebimiau, inside ISPConfig, i receive this error:

I verified my DNS settings on my DNS server, and everything is fine. The DNS server finds the mail server without a problem. My .zone file on the DNS server shows:

I asked a friend to test if he can "see" the mail server from outside my network. After using the command

Code:

ping mail.valeresponde.com.br

This result appears:

Code:

 
Starting against mail.valeresponde.com.br [200.190.167.101]
with 32 bytes of data:
 
Request server timeout
Request server timeout
Request server timeout
Request server timeout
 
Statistics of Ping to 200.190.167.101:
Packets: Sent = 4, Received = 0, Lost = 4 (100% of lost)

Probably something is blocking the transmission/receiving of packets from/to my network. What will i have to do? Shall i have to change settings of my DNS server? Or the problem might be the firewall?

Any help it's welcome!

 

first thing to check

Hello, the first thing I would check is that your using your internal mailserver to send out (best practice) and if not, then the external mailserver has to allow relay from you.

The headers of the rejection email will say which server it is trying to use.

James

 

I'm having a bit of problem receiving, but I think it's my config setting at my DNS service. The first thing I did to be able to send was open port 110 and 25 on my AP router as well as my DSL modem.

These might be able to help you troubleshoot your configuration.

Email/SMTP Test Utility: http://www.zoneedit.com/smtp.html
Mailbox/POP3 Test Utility: http://www.zoneedit.com/pop3.html?ad=smtptest
NSLookup: http://www.zoneedit.com/lookup.html?ad=pop3test

 

Is there a little point that i'm missing?

Hi Till !

I've checked the /etc/postfix/main.cf file, just as you said, and i've found two things:

1 - I didn't find the statement mynetworks = 127.0.0.0/8 in the TRUST AND RELAY CONTROL section. So, i've added it.

2 - Then, i've searched for the smtpd statement and i've found this line below:

smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination

which is straightly different than your hint mentioned before:

smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,check_relay_domains

Does the lack of these two parameters is the main reason for the mail server failure?


In addition, i've also checked the log for e-mails, in /var/log/maillog. And, between the most error messages, one of them is very common: Network is unreachable.

Take a look and tell me, please, what i'm missing here.

Aug 18 12:12:24 darwin postfix/smtp[24537]: connect to uipa01i82.usiminas.com.br[200.251.3.175]: Network is unreachable (port 25)
Aug 18 12:12:24 darwin postfix/smtp[24537]: connect to uipa01m10x.usiminas.com.br[200.251.3.249]: Network is unreachable (port 25)
Aug 18 12:12:24 darwin postfix/smtp[24537]: 8F01013A8067: to=<[email protected]>, relay=none, delay=11930, status=deferred (connect to uipa01m10x.usiminas.com.br[200.251.3.249]: Network is unreachable)
Aug 18 12:12:24 darwin postfix/smtp[24536]: connect to smtp.gerdau.com.br[200.213.29.36]: Network is unreachable (port 25)
Aug 18 12:12:24 darwin postfix/smtp[24536]: connect to smtp.gerdau.com.br[200.213.29.35]: Network is unreachable (port 25)
Aug 18 12:12:24 darwin postfix/smtp[24536]: 7039013A8066: to=<[email protected]>, relay=none, delay=11930, status=deferred (connect to smtp.gerdau.com.br[200.213.29.35]: Network is unreachable)
Aug 18 12:12:40 darwin postfix/smtp[24538]: connect to mail.valeresponde.com.br[200.190.167.101]: Network is unreachable (port 25)
Aug 18 12:12:40 darwin postfix/smtp[24538]: D812E13A8064: to=<[email protected]>, relay=none, delay=76968, status deferred (connect to mail.valeresponde.com.br[200.190.167.101]: Network is unreachable)
Aug 18 12:29:04 darwin postfix/qmgr[9006]: 57BCD13A805E: from=<[email protected]>, size=1147, nrcpt=1 (queue active)
Aug 18 12:29:04 darwin postfix/smtp[24874]: connect to smtp.e4w.com.br[200.150.150.17]: Network is unreachable (port 25)
Aug 18 12:29:04 darwin postfix/smtp[24874]: 57BCD13A805E: to=<[email protected]>, relay=none, delay=91746, status=deferred (connect to smtp.e4w.com.br[200.150.150.17]: Network is unreachable)

Thanks in advance!!

 

Can you ping the outside world? Try

Code:

ping -c4 www.google.com

 

The result is...

This is the result:

Code:

 
# ping -c4 [url="http://www.google.com/"]www.google.com[/url]
 
PING [url="http://www.l.google.com/"]www.l.google.com[/url] (64.233.167.99) 56(84) bytes of data.
 
 
--- [url="http://www.l.google.com/"]www.l.google.com[/url] ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 2999ms

 

Your system doesn't have a connection to the internet! Not very good for sending mails...

 

Perhaps a slight oversight but it appears that you were trying to ping www.google.com and could not ping it, it could have to do with your ISP blocking pings, I cannot ping it myself from work, ICMP to the net is blocked, but from home (verizon DSL) I can ping it. Just thought i'd help. Have a nice day!