[MlMt] Adding header fields to message view (was " attachment in headers display")

[Verdon Vaillancourt]

>> The main file you need to override is 
>> /Applications/MailMate.app/Contents/Resources/Layouts/headersFormatting.plist 
>> so you need to create ~/Library/Application 
>> Support/Resources/Layouts/headersFormatting.plist. You should start 
>> with a copy of the original and adapt it. You might also need to 
>> supplement 
>> /Applications/MailMate.app/Contents/Frameworks/OakMIME.framework/Versions/A/Resources/specifiers.plist 
>> which is done by adding a file with additional parser definitions at 
>> ~/Library/Application Support/MailMate/Resources/specifiers.plist
>
> Thanks for the tip on where/how to override the specifiers file. For 
> my circumstance, I believe I will need that as well as the formatting 
> file. Should be fun!

This actually worked really well and was easy. Although I added a 
shorthand to the specifiers.plist file for ‘delegate’, I’m not 
sure I actually needed it, as the headers field  ‘sender’  was 
already available to me in that file, and I didn’t actually reference 
the delegate shorthand in the headersFormatting.plist when I started 
working in there.

I basically just copied the section for “From” in the 
headersFormatting.plist file and changed all instances of “From” and 
“from” in the new section to “Sender” and “sender” and 
restarted MailiMate.

Now when I am viewing a message that has both a from and a sender field 
in the header, they are both displayed and in a standard message with 
just the from field, only that is displayed. The conditional logic 
behind it must be elsewhere.  Simple and brilliant customization.

Thanks for the pointer!
v