Hello,

I'm having serious problems last week and can't see any way out.

I've registered a top-level domain site.com pointing to my IPv6 address (6to4 tunnel). Everything looks ok, dig command, nslookup command shows requested output, but:

I'm not able to connect to mail.site.som on 110 port

I still get an error messaged, that connection has been refused. I've populated the ip6tables with commands to open desired port but with no success. I'm listening on 25, am able to connect to this port, but not to 110.

Command netstat -an | grep "LISTEN " shows that I'm not listening on 110 port, although I'm just added this port to the firewall exceptions.

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Can you please advise? What else can be wrong? Telnet to ::1/tunneled IPv6 address is succesful. Postfix installed, configured properly, ping6 working. Everytime I try to send email from external domain, I'm advised that the mail domain is not pointing to A record. I'm really desperate :/ Please help. Thank you

You have to configure your POP3 daemon to listen on port 110 on ipv6 as well. You didn't mention your POP daemon software (postfix is not a POP server).

Sounds like your POP3 server is not running.

What POP3 server are you using (i.e. Courier, Dovecot, Qpopper ...)?

What Linux Distribution are you using?

Regards,

Fordeck

Thanks for prompt reply, guys.

Well, I installed dovecot + pop3d courier.
I'm running the latest Ubuntu Server 10.10 distribution.
I've been trying to use Sylpheed to fetch email but I see your point.
If I'm not running POP daemon properly it wouldn't work. Can this be caused because of DNS? This was the very first time I've configured named.conf and everything, so not very sure.

Thanks

Just tried all your suggestions:

- dig command for MX and AAAA records shows desired output
- The POP3 daemon is working OUTPUT> +OK POP3 Ready & +OK opened mailbox for...
- The ip6tables are populated with required exceptions (25, 110)
- netstat command output shows

tcp6 0 0 :::25 :::* LISTEN
tcp6 0 0 :::53 :::* LISTEN
.
.

*but still not 110 :/ However as the POP3 is running I think everything should work.

I am able to telnet to ::1 for smtp, but not for port 110. telnet: Unable to connect to remote host: Connection refused. The funny part is, that now I'm not even able to telnet to mail.site.com on port 25, have no clue why. After trying to send email from external domain, I don't get SNY error message (no messages like host not found, network unreachable...)

I'm still a newbie in Linux. Maybe there is something very trivial, but after two weeks of hard investigation, I'm still not able to solve the very same problem.

If anything comes to your mind, please let me know. It's always worth of try. Thanks

Kind regards,

That would indicate that either dovecot is not running or your configuration is lacking something. It might be helpful for you to post the contents of /etc/dovecot.conf file. Also you might want to take a look at the dovecot wiki just to double check how you set it up.


Regards,

Fordeck

Thanks for your remarks.

It was about time to resolve this somehow. What I actually did was:

- Changed the IPv6-in-IPv4 tunnel to different provider
- Reinstalled Postfix / Mailutils (for POP3 daemon) etc. and proceeded step by step using PostfixBasicSetupHowto found on official Ubuntu documentation website.
- Resolved " -ERR chdir Maildir failed " error chmodding both the Maildir/ and Maildir/cur directories

It's working now!

No firewall modifications were needed. No updates to postfix master.cf were needed either. ISP was not blocking my ports...

Thank you all once again for help