I have not updated the printer or the mail server at all, but suddenly this morning the mail server is rejecting the emails from the printer with the message:
[192.168.100.30] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
It's worked perfectly for the last year until this morning!
Restart of printer didn't help. Anyone else have this problem?
restart or the sendmail instance resolved the issue.