I have a new Ubuntu 22.04 server installed on a raspberry pi 5
the server is behind OpenWrt router with WireGuard VPN
All ports are forwarding to the server
namp to the public IP
Starting Nmap 7.94SVN ( https://nmap.org ) at 2025-01-21 10:28 CST Nmap scan report for 186.72.28.48 Host is up (0.00043s latency). Not shown: 988 closed tcp ports (reset) PORT STATE SERVICE 22/tcp open ssh 25/tcp open smtp 53/tcp open domain 80/tcp open http 110/tcp open pop3 143/tcp open imap 443/tcp open https 465/tcp open smtps 587/tcp open submission 993/tcp open imaps 995/tcp open pop3s 8080/tcp open http-proxy

I looked at Dovcot but it looks clean
dovecot-mailcow-1 | Jan 21 10:29:27 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:29:27 fa501c039d71 dovecot: imap-login: Login: user=<barak-g@barak-kalai.com>, method=PLAIN, rip=10.0.7.1, lip=172.22.1.250, mpid=1618, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:29:42 fa501c039d71 dovecot: lmtp(941): Connect from 172.22.1.12 dovecot-mailcow-1 | Jan 21 10:29:42 fa501c039d71 dovecot: lmtp(941): Disconnect from 172.22.1.12: Logged out (state=MAIL FROM) dovecot-mailcow-1 | Jan 21 10:29:42 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250, TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:29:42 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250 dovecot-mailcow-1 | Jan 21 10:29:42 fa501c039d71 dovecot: managesieve-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250 dovecot-mailcow-1 | Jan 21 10:30:30 fa501c039d71 dovecot: lmtp(941): Connect from 172.22.1.12 dovecot-mailcow-1 | Jan 21 10:30:30 fa501c039d71 dovecot: lmtp(941): Disconnect from 172.22.1.12: Logged out (state=MAIL FROM) dovecot-mailcow-1 | Jan 21 10:30:30 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250, TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:30 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250 dovecot-mailcow-1 | Jan 21 10:30:30 fa501c039d71 dovecot: managesieve-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250 dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=10.0.7.1, lip=172.22.1.250, TLS: Connection closed, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Login: user=<yvonne@barak-kalai.com>, method=PLAIN, rip=10.0.7.1, lip=172.22.1.250, mpid=1676, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Login: user=<bkalai@barak-kalai.com>, method=PLAIN, rip=10.0.7.1, lip=172.22.1.250, mpid=1677, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Login: user=<barak-g@barak-kalai.com>, method=PLAIN, rip=10.0.7.1, lip=172.22.1.250, mpid=1678, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:30:41 fa501c039d71 dovecot: imap-login: Login: user=<barak@barak-kalai.com>, method=PLAIN, rip=10.0.7.1, lip=172.22.1.250, mpid=1679, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:31:25 fa501c039d71 dovecot: lmtp(941): Connect from 172.22.1.12 dovecot-mailcow-1 | Jan 21 10:31:26 fa501c039d71 dovecot: lmtp(941): Disconnect from 172.22.1.12: Logged out (state=MAIL FROM) dovecot-mailcow-1 | Jan 21 10:31:26 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250, TLS, TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) dovecot-mailcow-1 | Jan 21 10:31:26 fa501c039d71 dovecot: imap-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250 dovecot-mailcow-1 | Jan 21 10:31:26 fa501c039d71 dovecot: managesieve-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=172.22.1.12, lip=172.22.1.250
This a new server with backup installed from another server as I would like to preserver the emails
there are only 4 users so the raspberry pi 5 with 8gb should be able to handle this
Any help would be greatly appriciated