[Evolution] Signature not appended

[Jonathan Ryshpan <jonrysh pacbell net>]

I have a small script to invoke fortune, which I am attempting to use to append a signature to my emails.

The script:

$ cat ~/bin/mySignature

#!/bin/bash

echo "<div>-- </div>"

echo "<p>Sincerely Jonathan Ryshpan <jonrysh pacbell net</p>"

echo "<pre>"

/home/jonrysh/bin/myFortune

echo "</pre>"

I have set up a signature in 

evolution->edit->preferences->Composer Preferences->Signature

to invoke this script.  When I select the script by selecting "mySignature" in the choice box, typical output shows up in the preview box, e.g.:

<div>-- </div>
<p>Sincerely Jonathan Ryshpan <jonrysh pacbell net</p>
<pre>
		Windows NT crashed.
		I am the Blue Screen of Death.
		No one hears your screams.
</pre>

However no signature is ever appended.  Am I setting things up wrong, or is this a bug?

System setup:

Evolution version 3.38.4 (3.38.4-1.fc33) 

KDE Frameworks 5.79.0

Fedora Linux 33

Thanks - jon