If you find entries of the following format in your logfile sendmail[PID]: QUEUEID: ERROR: inconsistent reply, please ... (there might be other process names instead of sendmail, e.g., sm-mta, and the log entry might say "dsn" instead of "reply") then please send all log entries for QUEUEID and for PID (within a few minutes of each other) to sendmail-bugs-YYYY@support.sendmail.org where YYYY is the current year, e.g., 2022. If necessary, consistently replace any confidential data.