i am seeing occasional

    2024-11-18T00:03:11.981217+00:00 m0 postfix/smtpd[1756]: connect from 
mail.edusemx.com[66.85.163.236]
    2024-11-18T00:03:12.077728+00:00 m0 postfix/smtpd[1756]: SSL_accept error 
from mail.edusemx.com[66.85.163.236]: -1
    2024-11-18T00:03:12.077805+00:00 m0 postfix/smtpd[1756]: warning: TLS 
library problem: error:0A000102:SSL routines::unsupported 
protocol:../ssl/statem/statem_srvr.c:1657:
    2024-11-18T00:03:12.078082+00:00 m0 postfix/smtpd[1756]: lost connection 
after STARTTLS from mail.edusemx.com[66.85.163.236]
    2024-11-18T00:03:12.078311+00:00 m0 postfix/smtpd[1756]: disconnect from 
mail.edusemx.com[66.85.163.236] ehlo=1 starttls=0/1 commands=1/2

the net of a million lies says that the remote client does not like my
certificate.  i think i am using let's encrypt

    # grep tls /etc/postfix/main.cf
    #smtpd_tls_loglevel = 2
    smtpd_tls_cert_file=/etc/letsencrypt/live/m0.rg.net/fullchain.pem
    smtpd_tls_key_file=/etc/letsencrypt/live/m0.rg.net/privkey.pem
    smtpd_tls_security_level = may
    smtp_tls_CApath=/etc/ssl/certs
    smtp_tls_security_level = may
    smtp_tls_security_level = may
    smtp_tls_protocols = !SSLv2, !SSLv3
    smtpd_tls_protocols = TLSv1.3, TLSv1.2, !SSLv2, !SSLv3, !TLSv1
    smtp_tls_note_starttls_offer = yes
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
    smtpd_tls_session_cache_database =

https://ssl-tools.net/mailservers/m0.rg.net likes the server

maybe i am being too rude with `!SSLv2, !SSLv3, !TLSv1`?

tcpdump shows STARTTLS attempt then RST

clue bat appreciated

randy
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