Set Mail Signature with Run AppleScript Action inside an Automator workflow

Question

Hello,
Not sure if I am posting this at the right spot, but I would need some assistance. I am trying to write an Automator Workflow application. The purpose for this application is to:
1. Drag one or more attachments on the application/droplet icon
2. Automator workflow creates a new mail message in Mail with the attached items already addressed and ready to go to
I setup the following Workflow inside Automator:
1. New Mail Message
2. Add Attachments to Front Message
So this is all working just fine. Now I would like to add a step in between of type "Run AppleScript". In this "Run AppleScript" action I have the following code:
on run {input, parameters}
tell application "Mail"
set the message signature of input to signature "My Signature Name"
end tell
return input
end run
So my workflow looks now like this:
1. New Mail Message
2. Run AppleScript
3. Add Attachments to Front Message
I am getting the following error:
Can’t make «class situ» "My Signature Name" of application "Mail" into the expected type.
So, in essence I am trying to select a signature for that particular new mail message in this workflow. And that does not work. Any help would be appreciated.
Martin

Answer 1

first, you don't need the extra action to add attachments. if you drop some items on the saved application they will be passed to the "new Mail message" action as input and will be added as attachments. also, in my testing it seems that the processes of attaching the attachments seem to bump against the process of adding the signature. it get the same result as you originally but if I add a delay to the run applescript action then it works as it should so try
1. new mail message.
2. run applescript
on run {input, parameters}
delay 1
tell application "Mail"
set the message signature of (item 1 of input) to signature "My Signature Name"
end tell
return input
end run