I have installed Postfix, Dovecot, and Squirrelmail on a CentOS 5.5 machine. In Squirrelmail a user can send mail, but he is not receiving replies. There is nothing relevant in the maillog other than the user's (successful) login attempts. I am at loss, I have been following tutorials such as the Perfect Server [1] series and other Google results, but I cannot get this thing to receive mail. What should I be checking?
Thanks!
[1] http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-2
On Sun, Oct 17, 2010 at 6:39 PM, Dotan Cohen dotancohen@gmail.com wrote:
I have installed Postfix, Dovecot, and Squirrelmail on a CentOS 5.5 machine. In Squirrelmail a user can send mail, but he is not receiving replies. There is nothing relevant in the maillog other than the user's (successful) login attempts. I am at loss, I have been following tutorials such as the Perfect Server [1] series and other Google results, but I cannot get this thing to receive mail. What should I be checking?
Thanks!
[1] http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-2
-- Dotan Cohen
You will want to check your DNS and try to telnet to the server. If your server is behind NAT or you run split-dns it would be advisable to try it from another connection.
dig mx yourdomain.com telnet smtp.yourdomain.com 25
Of course if your mx record points to something other than smtp.yourdomain.com you will want to use that instead.
Ryan
On Mon, Oct 18, 2010 at 01:46, Ryan Wagoner rswagoner@gmail.com wrote:
You will want to check your DNS and try to telnet to the server. If your server is behind NAT or you run split-dns it would be advisable to try it from another connection.
dig mx yourdomain.com telnet smtp.yourdomain.com 25
Of course if your mx record points to something other than smtp.yourdomain.com you will want to use that instead.
Thanks, Ryan. The MX record looks fine, but telnet won't connect:
✈dcl:~$ dig mx sharingcenter.eu
; <<>> DiG 9.7.1-P2 <<>> mx sharingcenter.eu ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22263 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; QUESTION SECTION: ;sharingcenter.eu. IN MX
;; ANSWER SECTION: sharingcenter.eu. 86400 IN MX 10 mail.sharingcenter.eu.
;; AUTHORITY SECTION: sharingcenter.eu. 86400 IN NS ns2.sharingcenter.eu. sharingcenter.eu. 86400 IN NS ns1.sharingcenter.eu.
;; ADDITIONAL SECTION: mail.sharingcenter.eu. 86400 IN A 178.63.65.136
;; Query time: 88 msec ;; SERVER: 212.150.49.10#53(212.150.49.10) ;; WHEN: Mon Oct 18 21:52:25 2010 ;; MSG SIZE rcvd: 107
✈dcl:~$ telnet sharingcenter.eu 25 Trying 178.63.65.188... ^C ✈dcl:~$ telnet mail.sharingcenter.eu 25 Trying 178.63.65.136... telnet: Unable to connect to remote host: No route to host ✈dcl:~$
On the server, it looks like everything is running as it should: [root@mercury ~]# service postfix status master (pid 31800) is running... [root@mercury ~]# service dovecot status dovecot (pid 29751) is running... [root@mercury ~]# netstat -anp --tcp --udp | grep LISTEN | grep 25 tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 31800/master [root@mercury ~]#
What could I be missing? The logs are clean.
Am 18.10.2010 22:02, schrieb Dotan Cohen:
On the server, it looks like everything is running as it should: [root@mercury ~]# service postfix status master (pid 31800) is running... [root@mercury ~]# service dovecot status dovecot (pid 29751) is running... [root@mercury ~]# netstat -anp --tcp --udp | grep LISTEN | grep 25 tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 31800/master [root@mercury ~]#
The daemon is bound to localhost only.
What could I be missing? The logs are clean.
postconf -e 'inet_interfaces = all'
service postfix restart
Alexander
On Mon, Oct 18, 2010 at 22:06, Alexander Dalloz ad+lists@uni-x.org wrote:
The daemon is bound to localhost only.
Yes, that would be a problem!
What could I be missing? The logs are clean.
postconf -e 'inet_interfaces = all'
service postfix restart
Thanks! However, even after the change and confirming that postfix is listening properly: [root@mercury ~]# postconf -e 'inet_interfaces = all' [root@mercury ~]# service postfix restart Shutting down postfix: [ OK ] Starting postfix: [ OK ] [root@mercury ~]# netstat -anp --tcp --udp | grep LISTEN | grep 25 tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 7816/master [root@mercury ~]#
I still cannot cannot connect with telnet:
✈dcl:~$ telnet sharingcenter.eu 25 Trying 178.63.65.188... Trying 178.63.65.136... telnet: Unable to connect to remote host: Connection timed out ✈dcl:~$ telnet mail.sharingcenter.eu 25 Trying 178.63.65.136... telnet: Unable to connect to remote host: No route to host ✈dcl:~$ ping sharingcenter.eu PING sharingcenter.eu (178.63.65.188) 56(84) bytes of data. 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=1 ttl=50 time=85.0 ms 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=2 ttl=50 time=189 ms 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=3 ttl=50 time=92.0 ms ^C --- sharingcenter.eu ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 85.069/122.275/189.675/47.745 ms ✈dcl:~$
Why might that be?
Dotan Cohen wrote:
On Mon, Oct 18, 2010 at 22:06, Alexander Dalloz ad+lists@uni-x.org wrote:
<snip>
Thanks! However, even after the change and confirming that postfix is listening properly:
<snip>
I still cannot cannot connect with telnet:
âdcl:~$ telnet sharingcenter.eu 25 Trying 178.63.65.188... Trying 178.63.65.136... telnet: Unable to connect to remote host: Connection timed out âdcl:~$ telnet mail.sharingcenter.eu 25 Trying 178.63.65.136... telnet: Unable to connect to remote host: No route to host
<snip> Coming in late, and sorry if this has been suggested, but could it be a firewall rule blocking it?
mark
On 10/18/2010 04:18 PM, Dotan Cohen wrote:
On Mon, Oct 18, 2010 at 22:06, Alexander Dallozad+lists@uni-x.org wrote:
The daemon is bound to localhost only.
Yes, that would be a problem!
What could I be missing? The logs are clean.
postconf -e 'inet_interfaces = all'
service postfix restart
Thanks! However, even after the change and confirming that postfix is listening properly: [root@mercury ~]# postconf -e 'inet_interfaces = all' [root@mercury ~]# service postfix restart Shutting down postfix: [ OK ] Starting postfix: [ OK ] [root@mercury ~]# netstat -anp --tcp --udp | grep LISTEN | grep 25 tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 7816/master [root@mercury ~]#
I still cannot cannot connect with telnet:
?dcl:~$ telnet sharingcenter.eu 25 Trying 178.63.65.188... Trying 178.63.65.136... telnet: Unable to connect to remote host: Connection timed out ?dcl:~$ telnet mail.sharingcenter.eu 25 Trying 178.63.65.136... telnet: Unable to connect to remote host: No route to host ?dcl:~$ ping sharingcenter.eu PING sharingcenter.eu (178.63.65.188) 56(84) bytes of data. 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=1 ttl=50 time=85.0 ms 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=2 ttl=50 time=189 ms 64 bytes from static.188.65.63.178.clients.your-server.de (178.63.65.188): icmp_req=3 ttl=50 time=92.0 ms ^C --- sharingcenter.eu ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 85.069/122.275/189.675/47.745 ms ?dcl:~$
Why might that be?
Firewall?
No, I should have mentioned that the firewall is open:
[root@mercury public_html]# iptables -L -n -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination [root@mercury public_html]#
-
Alexander Dalloz -
Dotan Cohen -
m.roth＠5-cent.us -
Ryan Wagoner -
Steve Clark