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. 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 > > >> ---------------------------------------------------------------------- >> - Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx - >> - AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 - >> - - >> - Errors have occurred. We won't tell you where or why. We have - >> - lazy programmers. - >> ---------------------------------------------------------------------- > > -- > users mailing list > users@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe or change subscription options: > https://admin.fedoraproject.org/mailman/listinfo/users > Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct > Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines > Have a question? Ask away: http://ask.fedoraproject.org -- Andy The only person to have all his work done by Friday was Robinson Crusoe -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
