PostFix MailServer + DynDNS + centOS

mosesaro · 01-16-2011, 02:35 PM

I have a centos mailserver setup with postfix with webmin. I can send email from the server but i cant receive email back. My ISP is not blocking port 25. what can i do so i can receive email. Also i heard that some mail providers block dynamic IPs what can i do so my email can go through to others like hotmail. Thank you

PS Ive been banging my head since the morning trying to figure this out and yes im a noob. So if possible please help me out.

repo · 01-16-2011, 02:39 PM

Quote:

Also i heard that some mail providers block dynamic IPs what can i do so my email can go through to others like hotmail. Thank you

Get a static IP

Do you have a domainname, and did you setup the MX records?

Kind regards

mosesaro · 01-16-2011, 02:46 PM

yes i have a domain name and im able to set up mx records with dyndns. but i still cant receive email i think my postfix might not be configured correctly. I currently cant afford a static ip. But while i was waiting for a reply i did manage to find out about smtp relay using your isp or something. Can somebody share some insights on that. thank you

repo · 01-16-2011, 02:51 PM

Quote:

i did manage to find out about smtp relay using your isp or something.

take a look at
http://www.postfix.org/BASIC_CONFIGURATION_README.html

What happens if you telnet to the server at port 25 from the server, and from the outside?
Did you forward port 25 to the server at the router?
Is the mailserver running?
Firewall?
What are the errormessages?

Kind regards

mosesaro · 01-16-2011, 02:54 PM

I cant telnet telnet at all im thinking because it is blocked. but i did manage to ssh using port 25. Also for testing purposes i put my server on dmz so the router forwards all ports to the server. I also disabled the firewall just so i can exclude other options from giving problems.

repo · 01-16-2011, 02:57 PM

what is the output from

Code:

telnet 127.0.0.1 25

on the server

Kind regards

mosesaro · 01-16-2011, 03:03 PM

trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 cyberneticcore.home ESMTP Postfix

repo · 01-16-2011, 03:05 PM

So the mailserver is running and listening.
Try to do the same from the outside.

Kind regards

mosesaro · 01-16-2011, 03:07 PM

trying 72.2**.2*.**...
Connected to **********.net,.
220 cyberneticcore.home ESMTP Postfix

repo · 01-16-2011, 03:08 PM

What are the error messages when you sent a mail from the outside to your server?

Kind regards

mosesaro · 01-16-2011, 03:15 PM

I didn't get any but i never received an email. i have mobileme When i send it to my mobileme email mobileme receives instantly. When i replay in mobile me to my mailserver i dont get email

repo · 01-16-2011, 03:17 PM

When you sent a mail, you should receive an error message when it's not delivered.
Any pointers in the logfiles from the server?

Kind regards

mosesaro · 01-16-2011, 03:46 PM

i just tried installing another virtual server with ubuntu and ehcp the same problem

---------- Post added 01-16-11 at 04:46 PM ----------

how do i check logfiles

repo · 01-16-2011, 03:48 PM

Look in the /var/log directory
In general it's maillog
Do you get errors when you sent mail from the outside to the server?

Kind regards

mosesaro · 01-16-2011, 03:52 PM

no i have not received any errors yet on the outside server