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| Postfix: Can't connect [SOLVED] https://forum.linode.com/viewtopic.php?f=11&t=6778 |
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| Author: | yakatz [ Tue Mar 01, 2011 6:53 pm ] |
| Post subject: | Postfix: Can't connect [SOLVED] |
I am not sure if I am having a firewall (iptables) issue or a Postfix issue. When I try to send email to my linode, it get "No connection could be made because the target machine actively refused it __IP__:25" If I use telnet on the server itself, everything works fine. The reason I do not think that it is iptables' fault is because I ran a port scan: Ports blocked by iptables drop traffic, while this one, which is not blocked actually rejects traffic. (iptables rule: ACCEPT tcp -- anywhere anywhere multiport dports smtp ) I do not have a lot of experience with postfix, but I was following a guide on the linode library to set it up. System: Ubuntu 10.04 LTS i686 |
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| Author: | Stever [ Tue Mar 01, 2011 6:56 pm ] |
| Post subject: | |
Many ISPs block outgoing port 25 to prevent abuse - it is usually best to set up postfix to use smtps and/or submission ports for originating mail from external clients. |
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| Author: | yakatz [ Tue Mar 01, 2011 6:59 pm ] |
| Post subject: | |
Stever wrote: Many ISPs block outgoing port 25 to prevent abuse - it is usually best to set up postfix to use smtps and/or submission for originating mail from external clients. I am trying to set up a real mail server (so I can pipe mail to a php script, if it matters). And, I can connect to other servers on port 25 with no trouble. Is a bounce message better? Quote: **********************************************
** THIS IS A WARNING MESSAGE ONLY ** ** YOU DO NOT NEED TO RESEND YOUR MESSAGE ** ********************************************** The original message was received at Mon, 28 Feb 2011 16:34:43 -0500 (EST) from po4.mail.umd.edu [128.8.165.133] ----- The following addresses had transient delivery errors ----- <yakatz@ym-linode-01.10815.net> Final-Recipient: RFC822; yakatz@ym-linode-01.10815.net Action: delayed Status: 4.4.1 Remote-MTA: DNS; ym-linode-01.10815.net Last-Attempt-Date: Mon, 28 Feb 2011 20:40:46 -0500 (EST) Will-Retry-Until: Tue, 1 Mar 2011 16:34:43 -0500 (EST) |
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| Author: | Stever [ Tue Mar 01, 2011 7:03 pm ] |
| Post subject: | |
OK, I misunderstood the original post. Is postfix running? Code: # netstat -ltpn Should have a line like this: Code: tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 6705/master |
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| Author: | yakatz [ Tue Mar 01, 2011 7:08 pm ] |
| Post subject: | |
Stever wrote: OK, I misunderstood the original post. Is postfix running? Code: $ netstat -ltn Quote: Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp6 0 0 :::80 :::* LISTEN tcp6 0 0 :::22 :::* LISTEN tcp6 0 0 :::443 :::* LISTEN It appears to be running, but not bound to the main IP. Since I am not familiar with Postfix (my usual mail program is Microsoft SMTP/Exchange), I planned on using Webmin to manage postfix. How do I change the listening port? |
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| Author: | Stever [ Tue Mar 01, 2011 7:11 pm ] |
| Post subject: | |
It looks like you are only binding to localhost. You can set which interface postfix will bind to with "inet_interfaces" in main.cf. Normally you would use Code: inet_interfaces = all Not sure what you would do in webmin... |
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| Author: | yakatz [ Tue Mar 01, 2011 7:16 pm ] |
| Post subject: | |
Stever wrote: It looks like you are only binding to localhost. You can set which interface postfix will bind to with "inet_interfaces" in main.cf. Normally you would use
Code: inet_interfaces = all Not sure what you would do in webmin... Does it only bind to interfaces or can I use IP bindings like Apache? Thanks so much. |
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| Author: | Stever [ Tue Mar 01, 2011 7:28 pm ] |
| Post subject: | |
http://www.postfix.org/postconf.5.html#inet_interfaces |
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| Author: | yakatz [ Tue Mar 01, 2011 7:28 pm ] |
| Post subject: | |
Stever wrote: http://www.postfix.org/postconf.5.html#inet_interfaces
Thank you. |
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