==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.4.0 MariaDB edition
- Deployed with iRedMail Easy or the downloadable installer? iRedmail Easy
- 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.
   I don't know which logs to post, so if you guide me ill post them.
====

Summary of the Issue:
I have a very strange issue where emails are not delivered to Roundcube.
I can send email just fine but cannot receive.

Whenever I send an email from gmail to myself I can see email count increment in iRedadmin page email counter but in Roundcube nothing is received.

Setup:
I'm doing this on a homelab, with a residential internet connection

1) VPS hosted with Hertzner (ubuntu 20.04)
2) Local VM: wireguard VNP to hertzner VPS so I have access to port 25 and other port
     I used haproxy to forward ports from Hertzner to my local machine.
     followed this guide: Proxy SMTP & IMAP with HAPROXY

Help!!
in the attached screen shots you can see in the iRedadmin page there are some emails somewhere but in the roundcube page nothing shows.

Since I'm doing this for self learning, any pointers to where I should look in order to fix this will be very helpful.

Thank you