[MlMt] Adding header fields to pop-up menu in composition

[Bill Cole]

On 16 Mar 2018, at 14:34, Randall Gellens wrote:

> How would I add other header fields to the pop-up menu for extra 
> header fields when composing a message?

Override the composerHeaders.plist file:

cd Library/Application\ Support/MailMate/Resources
cp 
/Applications/MailMate.app/Contents/Resources/Layouts/composerHeaders.plist 
.
vi composerHeaders.plist

The format is an old-style non-xml ASCII property list, like all the MM 
customization files.