Sun Java System Messaging Server 6.3 Administration Guide

12.6.8 Stripping Illegal Blank Recipient Headers

Keywords: dropblank, nodropblank

In RFC 822 (Internet) messages, any To:, Resent-To:, Cc:, or Resent-Cc: header is required to contain at least one address—such a header may not have a blank value. Nevertheless, some mailers may emit such illegal headers. The dropblank channel keyword, if specified on a source channel, causes the MTA to strip any such illegal blank headers from incoming messages.