==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): stable 1.6.1
- Deployed with iRedMail Easy or the downloadable installer? Yes
- Linux/BSD distribution name and version: Ubuntu 20.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? No
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Hi Guys,

After interacting with the telegram group, im hereby opening a support topic for my issue facing with iRedMail fresh installation on Namecheap VPS.

i have setup iRedmail twice from yesterday but the issue remains same. Im not able to send or reply to incoming emails. I can receive emails but not able to send or reply back. It bounces with error message. I have tried sending to multiple domains, but still bounces back. The error message is pasted below this:

****************************************************************************************
This is the mail system at host mail.b2bemail.pro.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<ugendarraju@hotmail.com>: host
    hotmail-com.olc.protection.outlook.com[104.47.9.33] said: 550 Action not
    taken (in reply to end of DATA command)
Reporting-MTA: dns; mail.b2bemail.pro
X-Postfix-Queue-ID: 4MGQFd60ngz22P0
X-Postfix-Sender: rfc822; postmaster@b2bemail.pro
Arrival-Date: Mon, 29 Aug 2022 09:32:21 +0000 (UTC)

Final-Recipient: rfc822; ugendarraju@hotmail.com
Original-Recipient: rfc822;ugendarraju@hotmail.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; hotmail-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 Action not taken
Subject    Re: test
From    postmaster@b2bemail.pro
To    Ugendar V <ugendarraju@hotmail.com>
Date    Today 15:02
On 2022-08-29 15:01, Ugendar V wrote:
test

Sent from Mail [1] for Windows

************************************************************************************

i have tried checking the records, all set correctly. Please help me out