421 4.3.0 deliver: Trying to unput wrong character

"Mikhail T." <mi+cyrus@xxxxxxxxxxxxxxxxx> · Mon, 24 Jul 2017 01:19:59 -0400



    My procmail is configured to feed incoming mail into deliver:
    
      :0wr

        |sed 1d | /opt/cyrus/bin/deliver mi

      
    Recently I received an e-mail consisting of a PNG-file -- not an
    attachment, the body of the e-mail had content-type image/png. That
    message ended up in my /var/mail/mi mailbox -- because deliver would
    not accept it:

    421 4.3.0 deliver: Trying to unput wrong character

    
    Trying to upload the same message using mbox2imap, I get:

    mbox2imap: (alert) IMAP protocol error

      mbox2imap: (alert) Protocol response: NO

      mbox2imap: (alert) Diagnostic message: ['Message contains
        NUL characters']

      
    Why is deliver saying this, and what can I do to be able to receive
    such mail through Cyrus the way I was able to receive them through
    regular Unix mail for years? Thank you!

    -mi

    
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