postfix/smtpd handles incoming connections. Looks here like this:

2025-12-10T00:05:17.608532+01:00 postbote postfix/smtpd[2835935]: Anonymous TLS connection established from xxxxxxxx[81.xxxxxxx]: TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)

So your piece of log is an incoming connection, not secured by tls and using plain authentication (sasl_method=plain).

I thought I was OK here...

I have:
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_tls_cert_file = /etc/letsencrypt/live/mail.jungersen.dk/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mail.jungersen.dk/privkey.pem
smtpd_tls_security_level = may
smtpd_tls_auth_only = yes


??
Danjel
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