MacOS – How to get Apple Mail to pick the correct From: address

Try this.

   using terms from application "Mail"
    on perform mail action with messages theMessages for rule theRule
        -- The folder to save the attachments in (must already exist)


        -- Save in a sub-folder based on the name of the rule in Mail

        set subFolder to name of theRule
        tell application "Finder"
            set attachmentsFolder to ((path to home folder as text) & "Dropbox:Attachments") as text
            if not (exists folder subFolder of folder attachmentsFolder) then
                make new folder at attachmentsFolder with properties {name:subFolder}
            end if
        end tell
        tell application "Mail"

            repeat with eachMessage in theMessages

                set {year:y, month:m, day:d, hours:h, minutes:min} to eachMessage's date sent
                set timeStamp to ("" & y & "-" & my pad(m as integer) & "-" & my pad(d) & "-" & my pad(h) & "-" & my pad(min))

                try
                    -- Save the attachment
                    repeat with theAttachment in eachMessage's mail attachments

                        set originalName to name of theAttachment
                        set savePath to attachmentsFolder & ":" & subFolder & ":" & timeStamp & " " & originalName
                        try
                            save theAttachment in file (savePath)
                        end try
                    end repeat

                    display dialog subFolder
                end try
            end repeat

        end tell
    end perform mail action with messages
end using terms from

-- Adds leading zeros to date components
on pad(n)
    return text -2 thru -1 of ("00" & n)
end pad

I have posted a more general Automatically Save Attachments in Mail.app on my blog

Try:

function TJ() {
  var threads = GmailApp.search('label:inbox is:starred');
  for (var h = 0; h < threads.length; h++) {
    var messages = threads[h].getMessages();
    for (var i = 0; i < messages.length; i++) {
      if (messages[i].isStarred())
      {
        Logger.log(messages[i].getSubject());
        messages[i].unstar();
        messages[i].forward("recipient1@example.com", {
          // Advanced parameters: https://developers.google.com/apps-script/reference/gmail/gmail-message#forward%28String,Object%29
          cc: "myboss@example.com",
          bcc: "mybosses-boss@example.com,vp@example.com"
          });     
      }
  }
}
}

For more information regarding Google Apps Script, see this post: http://www.johneday.com/422/time-based-gmail-filters-with-google-apps-script