Comments on: How to install and Configure Postfix Mail Server on CentOS 8

By: Van Tran

Van Tran — Wed, 04 Aug 2021 02:04:45 +0000

In reply to Anindya. By default, Postfix uses port 25 for SMTP. For the sake of avoiding abuse for bad mail, most VPS service providers block this port. You can try the command telnet gmail-smtp-in.l.google.com 25, if you get a response like


Trying 74.125.68.26...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP m6si752389plx.46 - gsmtp

then you can use port 25 to send mail to external servers. Otherwise, you need to contact your service provider to ask them to open port 25. or configure Postfix to use a different port.

By: Anindya

Anindya — Fri, 22 Jan 2021 10:47:26 +0000

Hi,

Thank you for this tutorial.
I am able to send email to my own domain’s email addresses but unable to send email to any other domain.
Can you please help me on this?

Thanks,
Anindya

By: Pradeep Kumar

Pradeep Kumar — Sat, 29 Aug 2020 02:19:14 +0000

In reply to Kenny Ma. Yes, You can configure your email id in outlook after adding MX record. MX record will route the emails from outside world to your mail server (postfix). For Sending emails locally & to outside world doesn't need MX record.

By: Kenny Ma

Kenny Ma — Fri, 28 Aug 2020 11:14:52 +0000

Could we connect to mail server with outlook after adding MX record?
Anything we need to do in server?

By: Pradeep Kumar

Pradeep Kumar — Thu, 06 Aug 2020 02:13:44 +0000

In reply to Brian. You need to add MX record for your domain in DNS server to start receiving the emails from outside like Gmail, Yahoo etc

By: Brian

Brian — Wed, 05 Aug 2020 18:52:16 +0000

Thanks for your instruction.
I have received email in my Gmail, however, when I tried to reply, nothing came to my inbox. Can you give me some advice?

By: Pradeep Kumar

Pradeep Kumar — Tue, 28 Apr 2020 11:32:09 +0000

In reply to Bernardo. By looking at the logs, it seems like issue with hostname of your mailserver. Did u update the hostname in /etc/hosts file and /etc/postfix/main.cf.

By: Bernardo

Bernardo — Mon, 27 Apr 2020 20:41:48 +0000

Hello, the local mail sending/receiving works all right for me, but when I try to send a message to my gmail account it bounces back, without saying much (like it would in the case you pointed out of blocked IPs).

If could please check out the log file and maybe point out what could be wrong from it I would greatly appreciate it!

Here is the log output:
‘https://pastebin.com/kshmHbVc’

Note: I’ve changed some usernames/domain names for privacy reasons