My email is sending emails but not receiving emails. My ispconfig 3 is on a lxc container through proxmox 4. Any idea what could be the problem?
Which errors do you get in the mail.log? Can you reach port 25 from outside? Is the MX record of the domain name set to the hostname of this virtual machine?
I'd rather understand why certain providers block outgoing port 25 - but incoming? Open two shells to your server, one doing $tail -f /var/log/mail.info or $tail -f /var/log/maillog - depending on your operating system And on the other side restart postfix, also amavisd and dovecot services Are there any errors? Do you see something going on when trying to send mail to your server?
Fresh install. ISPConfig in Debian. Emails not sending or receiving. Could someone suggest me where to start my troubleshooting? Please
Typically that would be blocked by your ISP/vps provider, not a router that you own; to fix it, contact your provider and ask them to unblock it.
Excellent! You are right with the port 25 being black. I used Nmap and it not show port 25. Thanks a lot Jesse
You cannot run a mail server without port 25 being open both inbound and outbound; port 587 is used for your clients to authenticate to your server and send mail. So make sure your ISP knows you're running a mail server, and if they won't open port 25 for you, you'll have to "do something else". Eg. move your server somewhere where running a mail server is allowed, or setup some other mail server/service elsewhere on the internet to relay your mail in/out of your server.
The response was: The recipient server did not accept our requests to connect. Learn more at https://support.google.com/mail/answer/7720 [mail.example.com. xx.xx.18.233: timed out] how can fix this? mail.example.com its pointing to the right IP. How can I create a subdomain ? or a virtual server ? for mail.example.com ? my server name is server1.example.com
Seems as if your provider blocks port 25 incoming then, this means you can not run a mail server with that provider (no matter with or without ISPConfig>). If you want to run your own mail server, then get a virtual server in a datacenter e.g. at Linode, Hetzner or digitalocean. The domain / subdomain does not matter, so that's not the reason for your problem. Your provider blocks port 25 incoming which means that you can not run a mail server which is able to receive emails with that provider.
