Beader Hobo Error Message

You sent mail to and got back a DSN with the content:
 SMTP error from remote mailer after end of data:
    host []: 553 beader hobo

All it means is that the message-id didn't pass muster with the slightly pedantic MIT sendmail configuration. Probably it needs an "@" sign or surrounding brackets. A message id is supposed to be a syntactically valid email address in brackets. The mysterious message is a little joke, a corruption of "header boho".

There is also the similar "bender sobo" if you have an invalid sender address.

The programmer seems to have felt that these messages would be seen only by spammers, so that plain language would be wasted.

Daniel Feenberg
feenberg isat nber dotte org