Am 09.04.2015 um 22:06 schrieb Andy Blanchard:
Yep. Get it on the same network as the server and run the command:
telnet 192.168.10.1 25
Now guess what - it says
telnet: Unable to connect to remote host: No route to host
Of course I can ping from my laptop to my server and vice versa ...
Disabling SELinux didn't help.
You *should* get a welcome banner from Postfix. If you do, type
"QUIT" to exit cleanly - this means the problem is almost certainly
with the router.
If you don't, and based on your previous reply to Mike Wright I
suspect that is going to be the case, then you most likely need to
either look at FirewallD again or possibly SELinux.
The latter *should* have been sorted out automatically, but just in
case, you can temporarily disable SELinux with the command:
sudo setenforce 0
To reenable it, use the command:
sudo setenforce 1
On 9 April 2015 at 20:54, Peter Ulrich Kruppa <pukruppa@xxxxxxxxxxxxxx> wrote:
Am 09.04.2015 um 20:52 schrieb Andy Blanchard:
Hi Peter,
0.0.0.0 is a "wildcard"; Postfix is definitely running and listening
for incoming connections on port 25 on any IP address on your server.
Do you have access to another PC or something on your internal network
that you can try connecting from? At least that way you could
determine whether you need to focus on the router or the server -
although based on your updates on FirewallD and Postfix, I'm leaning
more towards either the router or your ISP blocking SMTP by default at
present.
Hi Andy,
I have some old laptop running debian. Can I do something with it - without
setting up another mail server on it? :-)
On the latter point, it might be worth looking at their FAQ or maybe
contacting support just in case; some ISPs block SMTP by default as an
anti-spam measure but will open it up on request, but others require
you have some form of "premium" connection to host your own servers.
Andy
On 9 April 2015 at 19:16, Peter Ulrich Kruppa <pukruppa@xxxxxxxxxxxxxx>
wrote:
Am 09.04.2015 um 19:05 schrieb Rick Stevens:
On 04/09/2015 07:22 AM, Peter Ulrich Kruppa wrote:
Am 09.04.2015 um 15:32 schrieb Robert Nichols:
On 04/09/2015 05:07 AM, Peter Ulrich Kruppa wrote:
I set up a Postfix-Server on my Fedora 21 box, which is connected to
the internet via
some Netgear Router. My private LAN is 192.168.10.0/24 with the
Fedora
box fixed on
192.168.10.1 . My Netgear thing has got a fixed IP and hostname,
let's
say for
mydomain.com .
Now I can
- send myself mails from my Fedora box
- send mails from my Fedora box to the outside p. ex. my
googlemail
account
but I can't receive mails from outside.
The default postfix configuration has it listening only on the
localhost
interface. You will have to change that. Look for "inet_interfaces
="
in /etc/postfix/main.cf .
I have got
inet_interfaces = all
in there.
Many ISPs block SMTP traffic TO their end users. Most also block
outgoing SMTP traffic FROM their end users _unless_ it's going to the
ISP's mail servers (this is to prevent end users from becoming spam
farms). Assuming your ISP permits bi-directional SMTP traffic, here
are things to look at:
It does - I had that working using a DSL bridge (modem) instead of a
router.
1. The outside world must send mail to the PUBLIC IP of your firewall
(not the 192.168.x.y address, but the one that's on the public
Internet). Make sure your MX DNS records reflect that public IP address.
If your MX records contain "192.168.x.y" or "10.x.y.z", then your record
is wrong (192.168.0.0/16 and 10.0.0.0/8 are non-routable, private
networks).
2. You must configure your external firewall to forward incoming port
25 traffic to port 25 on your postfix machine's PRIVATE IP address.
3. Make sure firewalld on your postfix machine permits incoming port 25
traffic.
Points 1. to 3. should be allright - hopefully ...
4. You must make sure postfix is listening on the private IP address (at
least). "netstat -lpnt | grep 25" will tell you what IPs postfix is
listening on.
# netstat -lpnt | grep 25
tcp 0 0 0.0.0.0:25 0.0.0.0:*
LISTEN 1494/master
How do I read/understand that output? Shouldn't there be 192.168.10.1:25
?
(By the way: I didn't know postfix daemon is called "master" ,,,)
Greetings
Peter
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