==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.3 MARIADB edition
- Deployed with iRedMail Easy or the downloadable installer? NO
- Linux/BSD distribution name and version: Ubuntu
- 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.

Jun 23 18:37:25 mail postfix/submission/smtpd[31517]: connect from localhost[127.0.0.1]
Jun 23 18:37:25 mail postfix/submission/smtpd[31517]: Anonymous TLS connection established from localhost[127.0.0.1]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256
Jun 23 18:37:25 mail postfix/submission/smtpd[31517]: 4QnrDj3ZNFz3t6B: client=localhost[127.0.0.1], sasl_method=LOGIN, sasl_username=postmaster@xxxx.com.br
Jun 23 18:37:25 mail postfix/cleanup[31519]: 4QnrDj3ZNFz3t6B: message-id=<2de02724cb8a2fa93d367505b4011870@xxxx.com.br>
Jun 23 18:37:25 mail postfix/qmgr[31506]: 4QnrDj3ZNFz3t6B: from=<postmaster@xxxx.com.br>, size=546, nrcpt=1 (queue active)
Jun 23 18:37:25 mail roundcube: <ndettl37> User postmaster@xxxx.com.br [192.168.4.12]; Message <2de02724cb8a2fa93d367505b4011870@xxxx.com.br> for xxxxx@hotmail.com; 250: 2.0.0 Ok: queued as 4QnrDj3ZNFz3t6B
Jun 23 18:37:25 mail postfix/submission/smtpd[31517]: disconnect from localhost[127.0.0.1] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8
Jun 23 18:37:25 mail postfix/amavis/smtp[31509]: SSL_connect error to 127.0.0.1[127.0.0.1]:10024: -1
Jun 23 18:37:25 mail postfix/amavis/smtp[31509]: warning: TLS library problem: error:0A00010B:SSL routines::wrong version number:../ssl/record/ssl3_record.c:354:
Jun 23 18:37:25 mail postfix/amavis/smtp[31509]: 4QnrDj3ZNFz3t6B: to=<xxxxxx@hotmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.13, delays=0.12/0/0/0, dsn=4.7.5, status=deferred (Cannot start TLS: handshake failure)

I'm having this issue and dont know how to fix it
i alredy tryed to change the certificate, but its don't work