==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1,6,7
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version: Ubuntu 22.04.3 LTS installer
- 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.
====
Good afternoon. There is a postfix+dovecot server (2.3.16)
Three machines from the branch (Windows 7) do not connect to the mail server.
Dovecot makes a reply:
mail dovecot: imap-login: Disconnected: Connection closed: SSL_accept() failed: error:0A000102:SSL routines::unsupported protocol  (no auth attempts in 0 secs): user=<>, rip=IP_vn, lip=IP_srv, TLS handshaking: SSL_accept() failed: error:0A000102:SSL routines::unsupported pr protocol, session
mail dovecot: imap-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip= IP_vn, lip= IP_srv, TLS handshaking: Connection closed, session

From the logs it is clear that the ssl server does not understand when a client connects to it
I can’t figure out what’s wrong, there are similar PCs that work great and the connection works fine.
clients
windows live mail
windows live mail 2012