> Where in the mail transport chain is the "To" changed from the email address > to "Undisclosed recipients"?
It's not. 'Undisclosed recipients' is a fake header (technically an empty group of recipient mailboxes: the only way to at once have a header be *present* and RFC-formatted, yet at the same time not claim to reflect any underlying message routing). It is added when there are no To: or Cc: headers in the submitted message. Clients can add it during submission, or MTAs after submission -- depends on when the message first hits an app that likes this non-RFC, but quite common, means of message 'fixup'. Note that per RFC, MTAs that claim compliance with RFC 822 _could_ certainly outright reject or return messages that do not contain at least one of To: or Cc:, but the 'liberal in what you accept...' attitude prevails here. > I have a hunch that my MIME issue (garbled emails) happens when the > recipient is "Undisclosed recipients". Well, it is an occasion in which an MTA may have taken it upon itself to add a header beyond RFC. All MTAs add message headers per RFC (Received: the prime example), so _in theory_ the code to pop open the file and insert a header should be relatively stable across different header content. However, the full implementation could be broken. --Sandy ------------------------------------ Sanford Whiteman, Chief Technologist Broadleaf Systems, a division of Cypress Integrated Systems, Inc. e-mail: [EMAIL PROTECTED] SpamAssassin plugs into Declude! http://www.imprimia.com/products/software/freeutils/SPAMC32/download/release/ Defuse Dictionary Attacks: Turn Exchange or IMail mailboxes into IMail Aliases! http://www.imprimia.com/products/software/freeutils/exchange2aliases/download/release/ http://www.imprimia.com/products/software/freeutils/ldap2aliases/download/release/ To Unsubscribe: http://imailserver.com/support/discussion_list/ List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://imailserver.com/support/kb.html
