On Oct 18, 2011, at 6:59 AM, Mary Ann wrote:

If a person on the list sends mail to the list with a CC, Dada strips it out All of the major discussion list platforms leave this information in the email

You know, it may be as simple as this:

When you have Dada Mail send mail via the sendmail command, the entire command looks like this (where, "/usr/sbin/sendmail" is the path to your sendmail):

/usr/bin/sendmail -t

The, "-t" flag says to do this (at least this is what the sendmail alias for Postfix on my Mac says):

-t Extract recipients from message headers
 These are added to any recipients specified on the command line
 

Which is illuminating, since what it's saying to the sendmail script is doing exactly what we have always wanted: find the addresses in the To: header of the message we're giving it and send messages to them If there are addresses in the, "Cc:" or, "Bcc:" headers, those address would also be sent to - that's what the, -t flag does (and that's why I've manually removed those headers from incoming messages in Dada Mail)

BUT, there is already an option in Dada Mail to not use the, "-t" flag If not using the, "-t" flag, you need to list the recipients as part of the command, like this:

/usr/bin/sendmail someone@example
com

and that's what Dada Mail does when you have a discussion list, since it lists the List Email in the, "To:" header - NOT the address that is getting sent the message - and that address isn't receiving any messages It looks like this in DADA::Mail::Send -

[snip]

if( $local_li->{group_list} == 1 && $fields{from_mass_send} == 1 && defined($local_li->{discussion_pop_email}) # safegaurd? ){

       $live_mailing_settings  =~ s/\-t//; # remove any, "-t" flags


 
       $live_mailing_settings 
= ' ' 
 $plain_to_address;  

[/snip]

SO, what's this all mean?

It probably means, (and I haven't tested this yet), Dada Mail already has support to send a message with a Cc: header intact, without sending that message out (at least when sending via sendmail - not sure about a straight SMTP connection) and we're (meaning, "me") are just randomly removing the Cc: header because we think we still need to

So, that's indeed a bug - and perhaps an option can be added to remove Cc: and Bcc: headers from discussion lists if you'd like

And for the question of, "How do other mailing list managers pull this off", the answer is, "because most any mail server allows you to" And that's probably why, when researching this problem, I can't find anything about it

Hopefully, that was illuminating! :)