[imp] IMP 4.3.4 - Add PGP Keyserver

[David]

Hello,

I am using IMP 4.3.4 with Groupware Webmail Edition 1.2.3. How do I add
a keyserver to the $conf['utils']['gnupg_keyserver'] array in
/imp/config/conf.php?

I have tried manually adding and removing from the file, reloading but
the Admin console always replaces my settings with the default
pgp.mit.edu and keyserver.noreply.org.

I even tried adding new servers to the conf.bak.php and reverting the
settings, but my settings (saved the the bak) were replaced with the
default servers.

I didn't see any settings that might be hiding the the MySQL db, am I
overlooking something else?

Here is what I am trying to add:

$conf['utils']['gnupg_keyserver'] =
array('keyserver.pgp.com','keys.hush.com','pgp.mit.edu');