[Mailman-Users] mails send from sendmail with commandline to mailman become 'Message has implicit destination'

Mark Sapiro mark at msapiro.net
Sat Dec 26 22:52:54 EST 2015

> my issue is when i send a email by using sendmail commandline to mailist
> , maillist services can not read this message correctly , the message
> will become a "Message has implicit destination" warning , but it did
> have a subject and i pretty sure that i have a subject and i did not use
> cc or bcc .

The message file that you sent did not contain a To: header with the
list address.

The sendmail command, unlike the mail command, does not add headers to
the input and your message must have a To: header with the list address
in order to not be flagged for implicit destination.

In other words if you are sending the message with some command like

sendmail -r you at example.com list at example.com < input_file

the file input_file must contain things like

To: list at example.com
From: you at example.com
Subject: The message subject

The body
of the message

The sending MTA will probably add headers like Message-ID: and Date:,
but it won't add To: which is your issue.

If you want to use a command line command that will add header like To:
and Subject: use the mail command, not the sendmail command.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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