Centos – Postfix dovecot remote mail client connection

centosdovecotemail-serverpostfix

I am stuck in the following issue for like hours. Hopefully someone can help me out this one :x..

I set up a mail server to receive and send e-mails. receiving by imap.

The problem I am facing is as follow.

On the webserver I created two mail account, I am able to send messages to each other by using mailx or telnet (directly on the server). Now I want to add these mail accounts to my mail client at my desktop PC. I did this but I am not able to send any e-mail or receive any e-mails sending from in the client.

When I make use of xmail or telnet mailing I directly get a message in the imap account configured at my mail client (desktop pc).

I put open all the needed ports for mailing;

25/tcp   open  smtp
80/tcp   open  http
110/tcp  open  pop3
143/tcp  open  imap
443/tcp  open  https
993/tcp  open  imaps
995/tcp  open  pop3s
2222/tcp open  EtherNet/IP-1
8443/tcp open  https-alt

Please any suggestions so I can try to figure this thing out.

Hope mu information can tell something to you, else let me know what
you would know or needed.

Thanks in advance!

Best Answer

Without more information from your side, I can only give you some basic clues.

It looks like your mail service is somewhere limited to be accessible only from/to localhost. Depending on the server OS your server is running on, it can be set quite restrictive by default, allowing only local access (127.0.0.1).

  1. Check your firewall configs in /etc/sysconfig/iptables, e.g.:

    :USER_IMAP - [0:0] -A INPUT -p tcp -m tcp --dport 143 --syn -j ACCEPT -A INPUT -p tcp -m tcp --dport 993 --syn -j ACCEPT :USER_POP3 - [0:0] -A INPUT -p tcp -m tcp --dport 110 --syn -j ACCEPT -A INPUT -p tcp -m tcp --dport 995 --syn -j ACCEPT

  2. Check SELinux status with sestatus (with Status disabled / permissive you can go ahead)

  3. Check your Postfix config. Make sure it is configured correctly for what domains to receive/send mails for (e.g. default is to receive mail for the machine itself only), so for receiving Mail worldwide check your /etc/postfix/main.cf:

    mydestination = $myhostname localhost.$mydomain localhost $mydomain

  4. Also check your Dovecot config in /etc/dovecot/dovecot.conf, e.g. for IPv4 it should be set to

    listen = *

    With dovecot -n you can check how Dovecot is finally set up. Also check if all needed ports are also listening: netstat -tulpn |grep LISTEN

Hope that helps, Megodin

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