PHP Error - 2.3 Upgrade

I didn't get very far with this upgrade - I disabled all add-ons after backing up, started the upgrade and got this error:

ErrorException: [E_WARNING] Undefined array key "emailDkim" in src/XF/Install/Upgrade/2030037-230b7.php at line 46

1. XF::handlePhpError() in src/XF/Install/Upgrade/2030037-230b7.php at line 46
2. XF\Install\Upgrade\Version2030037->step4() in src/XF/Install/Controller/Upgrade.php at line 192...

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