I'm starting to get several log entries for several errors of type:

553ORCPT address syntax error

The error is intermittent since the server is able to process other incoming mails without error. For instance, I just sent myself an email from GMail, and it came through successfully.

Typical log entry will look like:

Feb  3 06:02:26 callistus smtpd[21460]: cb9690ea8af2a8ec smtp connected address=198.2.185.67 host=mail67.suw111.mcdlv.net Feb  3 06:02:26 callistus smtpd[21460]: cb9690ea8af2a8ec smtp tls ciphers=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 Feb  3 06:02:27 callistus smtpd[21460]: cb9690ea8af2a8ec smtp failed-command command="RCPT TO:<li...@datagenic.com> ORCPT=rfc822;li...@datagenic.com" result="553 ORCPT address syntax error" Feb  3 06:02:27 callistus smtpd[21460]: cb9690ea8af2a8ec smtp disconnected reason=quit

Mail logs prior to latest update to 6.6-current are free of these errors, so presumably the regression has been introduced in the latest snapshot (OpenBSD 6.6-current (GENERIC.MP) #628: Sat Feb  1 23:32:22 MST 2020). In fact, it looks as though it is related to this recent commit: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.sbin/smtpd/smtp_session.c.diff?r1=1.422&r2=1.423

In which case, it may be suggested that the change is being perhaps a little too strict.


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