> I'm seeing periodic entries like this in my maillog:
> Dec 12 13:12:47 xavier postfix-116/smtpd[1683671]: warning: TLS library 
> problem: error:0A000438:SSL routines::tlsv1 alert internal 
> error:ssl/record/rec_layer_s3.c:1584:SSL alert number 80:


> smtp_tls_cert_file=/etc/letsencrypt/fullchain.pem
> smtp_tls_key_file=/etc/letsencrypt/privkey.pem

usually there is no need for client certificates when sending emails.

> smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
> smtp_tls_exclude_ciphers       = MD5, RC4, 3DES, IDEA, SEED, aNULL
> smtpd_tls_security_level = may
> smtpd_tls_exclude_ciphers       = MD5, RC4, 3DES, IDEA, SEED, aNULL
> tls_preempt_cipherlist          = yes
> smtpd_tls_mandatory_ciphers     = high
> smtpd_tls_auth_only = yes
> smtpd_tls_cert_file = /etc/letsencrypt/fullchain.pem
> smtpd_tls_key_file = /etc/letsencrypt/privkey.pem

Are you sure cert/key_file path is correct?

Those filenames look like they are generated by certbot, wich places files
(softlinks) in 
not in /etc/letsenrypt/{fullchain.pem,...} on my server.

Did you check if the certificate is valid?
openssl x509 -text < /etc/letsencrypt/cert.pem
openssl x509 -text < /etc/letsencrypt/live/<servername>/cert.pem

// cert.pem contains your public certificate only whereas fullchain.pem
// additionally contains letsencrypt's intermediate certificate.
// For verification try cert.pem for smtpd_tls_cert_file use fullchain.pem

Best regards

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