Hello, can i use let's encrypt for postfix?

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Already there, i have a new message from postfix ;
openssl s_client -connect mail.logic-immo.site:465 -starttls smtp -tls1_1

CONNECTED(00000003)
139637341865792:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:ssl/record/ssl3_record.c:332:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 217 bytes and written 166 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.1
    Cipher    : 0000
    Session-ID: 
    Session-ID-ctx: 
    Master-Key: 
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1687013754
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
---

my main.cf contain ;

smtp_tls_cert_file = /etc/letsencrypt/live/mail.logic-immo.site/fullchain.pem
smtp_tls_key_file = /etc/letsencrypt/live/mail.logic-immo.site/privkey.pem
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_CAfile = /etc/ssl/certs/ca-bundle.crt
smtpd_tls_cert_file = /etc/letsencrypt/live/mail.logic-immo.site/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mail.logic-immo.site/privkey.pem
smtpd_tls_CApath = /etc/ssl/certs
smtpd_tls_CAfile = /etc/ssl/certs/ca-bundle.crt

and also

smtp_tls_wrappermode = yes
smtpd_tls_ask_ccert = no
smtpd_tls_exclude_ciphers = RC4
smtpd_tls_received_header = yes
smtpd_tls_mandatory_protocols = !TLSv1:!TLSv1.1:!TLSv1.2
smtpd_tls_protocols = !TLSv1:!TLSv1.1:!TLSv1.2
smtpd_tls_mandatory_ciphers = medium
tls_medium_cipherlist = ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
tls_preempt_cipherlist = no