I use a service named Rollernet.us to relay email to my SME server. According to their logs these few emails were rejected, and Ive researched that this is because I'm not advertising SMTPUTF8 in my connection's HELO/EHLO.
Apparently the emails are just dropped. Neither 'SMTPUTF8' or 'UTF8' are mentioned in any of the qpsmtpd /sqpsmtpd /qmail logs, in fact i can find no record of the connection at all on my end. Is there a log that records failed SMTP handshakes?
At Rollernet.us, I recently enabled email mirroring, so I was able to read this rejected email. Its just a notice from a website that I have an account with. I usually get their notices, but occasionally some went missing, so this is must be why. Occasionally they require SMTPUTF8.
Packages like Postfix have a setting to enable or disable SMTPUTF8, so I was hoping there might be a setting available for SME's smtp service.