Since 10.5 I can no longer script the sender if sending a mail via Mail

Question

I would use the following script to send mail from different mail accounts using just the one account in 10.4.
set theBody to "abc"
set theSubject to "XYZ"
set theTarget to "[email protected]"
tell application "Mail"
set newMessage to make new outgoing message with
roperties {subject:theSubject, content:theBody}
tell newMessage
make new to recipient at end of to recipients with properties {address:theTarget}
*set sender to "[email protected]"*
end tell
send newMessage
end tell
*set sender to "[email protected]"* no longer works since upgrading to 10.5. It is ignored and the name of the account it is sends from is used in its place.
Does anybody know how to fix this in 10.5?
Message was edited by: ChangeAgent

Answer 1

No, I get my mail on my computer, not on a website. I used to be able to see the information but in sorting another issue I must have changed a setting or something. I have gone to View. Under Message Attributes most things are ticked but many of them are not bold print i.e. they are pale grey. I don't know how to activate them again.