"Correspondent" column for Viewer Window/Italicize outgoing e-mail (like "Show InOut" Tbird extension and Mail.app MailHub plugin)

I have something like this as a low-priority item on my todo list. The low priority is mainly because I haven't quite decided how it should work, e.g., how to best identify an outgoing message.

If you only have a single identity (or unique name) then it can be “hacked” by putting the following in this file: ~/Library/Application Support/MailMate/Resources/MmMessagesOutlineView/outlineColumns.plist

{
    columns =
    {
        correspondent =
        {
            title = "Correspondent";
            sortKey = "to.split.name,to.split.address";
            matchQueries =
            {
                knownFrom = "from.name = 'Benny Kjær Nielsen'";
                notKnownFrom = "from.name != 'Benny Kjær Nielsen'";
            };
            formatting =
            {
                type = firstMatch;
                children =
                (
                    {
                        matchQuery = knownFrom;
                        formatString = "To: ${to.name:${to.address}}";
                    },
                    {
                        matchQuery = notKnownFrom;
                        formatString = "${from.name:${from.address}}";
                    },
                );
            };
        };
    };
}

Note that it is hardcoded to my name. You would need to change that to make it work. Note that I'm not sure how well this works in practice. Feedback is welcome.

I'll put this ticket in the accepted state as a feature request to have something like the above as a built-in feature. An implementation of such a feature should be based on making a “virtual” header named Correspondent available. This would then also make the feature available for other parts of MailMate (searching, smart mailboxes, dynamic submailboxes, etc.).

Very late update to this ticket. A “Correspondent” column has now existed in MailMate for quite a long time. (It's also available in other parts of the interface.)